diff --git a/libexec/rtld-elf/rtld.h b/libexec/rtld-elf/rtld.h
index c145fa1bd7e6..21da9d9cde0f 100644
--- a/libexec/rtld-elf/rtld.h
+++ b/libexec/rtld-elf/rtld.h
@@ -194,7 +194,7 @@ unsigned long elf_hash(const char *);
 const Elf_Sym *find_symdef(unsigned long, const Obj_Entry *,
   const Obj_Entry **, bool, SymCache *);
 void init_pltgot(Obj_Entry *);
-void lockdflt_init();
+void lockdflt_init(void);
 void obj_free(Obj_Entry *);
 Obj_Entry *obj_new(void);
 int reloc_non_plt(Obj_Entry *, Obj_Entry *);
diff --git a/libexec/rtld-elf/rtld_lock.h b/libexec/rtld-elf/rtld_lock.h
index 941b19e83bf7..cca4f18ed14f 100644
--- a/libexec/rtld-elf/rtld_lock.h
+++ b/libexec/rtld-elf/rtld_lock.h
@@ -33,14 +33,14 @@
 struct RtldLockInfo
 {
 	unsigned int rtli_version;
-	void *(*lock_create)();
+	void *(*lock_create)(void);
 	void  (*lock_destroy)(void *);
 	void  (*rlock_acquire)(void *);
 	void  (*wlock_acquire)(void *);
 	void  (*lock_release)(void *);
 	int   (*thread_set_flag)(int);
 	int   (*thread_clr_flag)(int);
-	void  (*at_fork)();
+	void  (*at_fork)(void);
 };
 
 extern void _rtld_thread_init(struct RtldLockInfo *);