diff --git a/kernel/allowlist.c b/kernel/allowlist.c
index 7334bbb0..0820cd67 100644
--- a/kernel/allowlist.c
+++ b/kernel/allowlist.c
@@ -63,7 +63,7 @@ static void remove_uid_from_arr(uid_t uid)
 	kfree(temp_arr);
 }
 
-static void init_default_profiles()
+static void init_default_profiles(void)
 {
 	kernel_cap_t full_cap = CAP_FULL_SET;
 
@@ -110,7 +110,7 @@ void ksu_show_allow_list(void)
 }
 
 #ifdef CONFIG_KSU_DEBUG
-static void ksu_grant_root_to_shell()
+static void ksu_grant_root_to_shell(void)
 {
 	struct app_profile profile = {
 		.version = KSU_APP_PROFILE_VER,
diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index 6e7d2167..6a77d32c 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -135,10 +135,10 @@ static bool ksu_module_mounted = false;
 extern int handle_sepolicy(unsigned long arg3, void __user *arg4);
 
 bool ksu_su_compat_enabled = true;
-extern void ksu_sucompat_init();
-extern void ksu_sucompat_exit();
+extern void ksu_sucompat_init(void);
+extern void ksu_sucompat_exit(void);
 
-static inline bool is_allow_su()
+static inline bool is_allow_su(void)
 {
 	if (is_manager()) {
 		// we are manager, allow!
@@ -322,7 +322,8 @@ int ksu_handle_rename(struct dentry *old_dentry, struct dentry *new_dentry)
 }
 
 #ifdef CONFIG_EXT4_FS
-static void nuke_ext4_sysfs() {
+static void nuke_ext4_sysfs(void) 
+{
 	struct path path;
 	int err = kern_path("/data/adb/modules", 0, &path);
 	if (err) {
@@ -342,7 +343,9 @@ static void nuke_ext4_sysfs() {
  	path_put(&path);
 }
 #else
-static inline void nuke_ext4_sysfs() { }
+static inline void nuke_ext4_sysfs(void)
+{
+}
 #endif
 
 int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
diff --git a/kernel/kernel_compat.c b/kernel/kernel_compat.c
index 8de66319..a1daa9de 100644
--- a/kernel/kernel_compat.c
+++ b/kernel/kernel_compat.c
@@ -61,7 +61,7 @@ static bool android_context_saved_checked = false;
 static bool android_context_saved_enabled = false;
 static struct ksu_ns_fs_saved android_context_saved;
 
-void ksu_android_ns_fs_check()
+void ksu_android_ns_fs_check(void)
 {
 	if (android_context_saved_checked)
 		return;
diff --git a/kernel/kernel_compat.h b/kernel/kernel_compat.h
index 9152e961..5f592171 100644
--- a/kernel/kernel_compat.h
+++ b/kernel/kernel_compat.h
@@ -57,7 +57,7 @@ extern long ksu_strncpy_from_user_nofault(char *dst,
 extern struct key *init_session_keyring;
 #endif
 
-extern void ksu_android_ns_fs_check();
+extern void ksu_android_ns_fs_check(void);
 extern struct file *ksu_filp_open_compat(const char *filename, int flags,
 					 umode_t mode);
 extern ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
diff --git a/kernel/ksu.c b/kernel/ksu.c
index fd4e0b0b..03801198 100644
--- a/kernel/ksu.c
+++ b/kernel/ksu.c
@@ -54,10 +54,10 @@ int ksu_handle_execveat(int *fd, struct filename **filename_ptr, void *argv,
 					    flags);
 }
 
-extern void ksu_sucompat_init();
-extern void ksu_sucompat_exit();
-extern void ksu_ksud_init();
-extern void ksu_ksud_exit();
+extern void ksu_sucompat_init(void);
+extern void ksu_sucompat_exit(void);
+extern void ksu_ksud_init(void);
+extern void ksu_ksud_exit(void);
 #ifdef CONFIG_KSU_TRACEPOINT_HOOK
 extern void ksu_trace_register();
 extern void ksu_trace_unregister();
diff --git a/kernel/ksud.c b/kernel/ksud.c
index 0cb5aaa6..37bb0d76 100644
--- a/kernel/ksud.c
+++ b/kernel/ksud.c
@@ -45,9 +45,9 @@ static const char KERNEL_SU_RC[] =
     "    exec u:r:su:s0 root -- " KSUD_PATH " boot-completed\n"
     "\n";
 
-static void stop_vfs_read_hook();
-static void stop_execve_hook();
-static void stop_input_hook();
+static void stop_vfs_read_hook(void);
+static void stop_execve_hook(void);
+static void stop_input_hook(void);
 
 #ifdef CONFIG_KSU_KPROBES_HOOK
 static struct work_struct stop_vfs_read_work;
@@ -627,7 +627,7 @@ int __maybe_unused ksu_handle_compat_execve_ksud(const char __user *filename_use
 
 #endif
 
-static void stop_vfs_read_hook()
+static void stop_vfs_read_hook(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
     bool ret = schedule_work(&stop_vfs_read_work);
@@ -638,7 +638,7 @@ static void stop_vfs_read_hook()
 #endif
 }
 
-static void stop_execve_hook()
+static void stop_execve_hook(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
     bool ret = schedule_work(&stop_execve_hook_work);
@@ -653,7 +653,7 @@ static void stop_execve_hook()
 #endif
 }
 
-static void stop_input_hook()
+static void stop_input_hook(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
     static bool input_hook_stopped = false;
@@ -672,7 +672,7 @@ static void stop_input_hook()
 }
 
 // ksud: module support
-void ksu_ksud_init()
+void ksu_ksud_init(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
     int ret;
@@ -692,7 +692,7 @@ void ksu_ksud_init()
 #endif
 }
 
-void ksu_ksud_exit()
+void ksu_ksud_exit(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
     unregister_kprobe(&execve_kp);
diff --git a/kernel/manager.h b/kernel/manager.h
index 37bafbe8..81871b69 100644
--- a/kernel/manager.h
+++ b/kernel/manager.h
@@ -13,17 +13,17 @@ extern void ksu_add_manager(uid_t uid, int signature_index);
 extern void ksu_remove_manager(uid_t uid);
 extern int ksu_get_manager_signature_index(uid_t uid);
 
-static inline bool ksu_is_manager_uid_valid()
+static inline bool ksu_is_manager_uid_valid(void)
 {
 	return ksu_manager_uid != KSU_INVALID_UID;
 }
 
-static inline bool is_manager()
+static inline bool is_manager(void)
 {
 	return unlikely(ksu_is_any_manager(current_uid().val) || ksu_manager_uid == current_uid().val);
 }
 
-static inline uid_t ksu_get_manager_uid()
+static inline uid_t ksu_get_manager_uid(void)
 {
 	return ksu_manager_uid;
 }
@@ -33,7 +33,7 @@ static inline void ksu_set_manager_uid(uid_t uid)
 	ksu_manager_uid = uid;
 }
 
-static inline void ksu_invalidate_manager_uid()
+static inline void ksu_invalidate_manager_uid(void)
 {
 	ksu_manager_uid = KSU_INVALID_UID;
 }
diff --git a/kernel/selinux/rules.c b/kernel/selinux/rules.c
index 28247acc..832cb6d2 100644
--- a/kernel/selinux/rules.c
+++ b/kernel/selinux/rules.c
@@ -38,7 +38,7 @@ static struct policydb *get_policydb(void)
 
 static DEFINE_MUTEX(ksu_rules);
 
-void apply_kernelsu_rules()
+void apply_kernelsu_rules(void)
 {
 	struct policydb *db;
 
@@ -220,7 +220,7 @@ static int get_object(char *buf, char __user *user_object, size_t buf_sz,
 }
 
 // reset avc cache table, otherwise the new rules will not take effect if already denied
-static void reset_avc_cache()
+static void reset_avc_cache(void)
 {
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 4, 0) ||	\
 	!defined(KSU_COMPAT_USE_SELINUX_STATE)
diff --git a/kernel/selinux/selinux.c b/kernel/selinux/selinux.c
index 893c4c0c..f1a544e9 100644
--- a/kernel/selinux/selinux.c
+++ b/kernel/selinux/selinux.c
@@ -101,7 +101,7 @@ static inline u32 current_sid(void)
 }
 #endif
 
-bool is_ksu_domain()
+bool is_ksu_domain(void)
 {
 	char *domain;
 	u32 seclen;
@@ -222,7 +222,7 @@ void susfs_set_kernel_sid(void)
 
 #define DEVPTS_DOMAIN "u:object_r:ksu_file:s0"
 
-u32 ksu_get_devpts_sid()
+u32 ksu_get_devpts_sid(void)
 {
 	u32 devpts_sid = 0;
 	int err = security_secctx_to_secid(DEVPTS_DOMAIN, strlen(DEVPTS_DOMAIN),
diff --git a/kernel/selinux/selinux.h b/kernel/selinux/selinux.h
index 22eef28c..ce3a8bb7 100644
--- a/kernel/selinux/selinux.h
+++ b/kernel/selinux/selinux.h
@@ -14,11 +14,11 @@ void setenforce(bool);
 
 bool getenforce(void);
 
-bool is_ksu_domain();
+bool is_ksu_domain(void);
 
 bool is_zygote(void *cred);
 
-void apply_kernelsu_rules();
+void apply_kernelsu_rules(void);
 
 #ifdef CONFIG_KSU_SUSFS_SUS_MOUNT
 bool susfs_is_sid_equal(void *sec, u32 sid2);
@@ -32,6 +32,6 @@ void susfs_set_init_sid(void);
 bool susfs_is_current_init_domain(void);
 #endif
 
-u32 ksu_get_devpts_sid();
+u32 ksu_get_devpts_sid(void);
 
 #endif
diff --git a/kernel/sucompat.c b/kernel/sucompat.c
index 403f36d4..d207055e 100644
--- a/kernel/sucompat.c
+++ b/kernel/sucompat.c
@@ -28,7 +28,7 @@
 #define SU_PATH "/system/bin/su"
 #define SH_PATH "/system/bin/sh"
 
-extern void escape_to_root();
+extern void escape_to_root(void);
 
 static const char sh_path[] = "/system/bin/sh";
 static const char ksud_path[] = KSUD_PATH;
@@ -372,7 +372,7 @@ static void destroy_kprobe(struct kprobe **kp_ptr)
 #endif
 
 // sucompat: permited process can execute 'su' to gain root access.
-void ksu_sucompat_init()
+void ksu_sucompat_init(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
 	su_kps[0] = init_kprobe(SYS_EXECVE_SYMBOL, execve_handler_pre);
@@ -389,7 +389,7 @@ void ksu_sucompat_init()
 #endif
 }
 
-void ksu_sucompat_exit()
+void ksu_sucompat_exit(void)
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK
 	int i;
diff --git a/kernel/throne_tracker.c b/kernel/throne_tracker.c
index 04065e9b..51e66780 100644
--- a/kernel/throne_tracker.c
+++ b/kernel/throne_tracker.c
@@ -328,7 +328,7 @@ static bool is_uid_exist(uid_t uid, char *package, void *data)
 	return exist;
 }
 
-void track_throne()
+void track_throne(void)
 {
 	struct file *fp =
 		ksu_filp_open_compat(SYSTEM_PACKAGES_LIST_PATH, O_RDONLY, 0);
@@ -440,12 +440,12 @@ out:
 	}
 }
 
-void ksu_throne_tracker_init()
+void ksu_throne_tracker_init(void)
 {
 	// nothing to do
 }
 
-void ksu_throne_tracker_exit()
+void ksu_throne_tracker_exit(void)
 {
 	// nothing to do
 }
diff --git a/kernel/throne_tracker.h b/kernel/throne_tracker.h
index 5d7f4770..969e4d63 100644
--- a/kernel/throne_tracker.h
+++ b/kernel/throne_tracker.h
@@ -1,10 +1,10 @@
 #ifndef __KSU_H_UID_OBSERVER
 #define __KSU_H_UID_OBSERVER
 
-void ksu_throne_tracker_init();
+void ksu_throne_tracker_init(void);
 
-void ksu_throne_tracker_exit();
+void ksu_throne_tracker_exit(void);
 
-void track_throne();
+void track_throne(void);
 
 #endif