diff --git a/sys/amd64/amd64/initcpu.c b/sys/amd64/amd64/initcpu.c
index 45244218821..588b6d48379 100644
--- a/sys/amd64/amd64/initcpu.c
+++ b/sys/amd64/amd64/initcpu.c
@@ -62,7 +62,7 @@ static void init_6x86(void);
 static void	init_6x86MX(void);
 static void	init_ppro(void);
 static void	init_mendocino(void);
-void	enable_sse();
+void	enable_sse(void);
 #endif
 
 int	hw_instruction_sse = 0;
diff --git a/sys/i386/i386/initcpu.c b/sys/i386/i386/initcpu.c
index 45244218821..588b6d48379 100644
--- a/sys/i386/i386/initcpu.c
+++ b/sys/i386/i386/initcpu.c
@@ -62,7 +62,7 @@ static void init_6x86(void);
 static void	init_6x86MX(void);
 static void	init_ppro(void);
 static void	init_mendocino(void);
-void	enable_sse();
+void	enable_sse(void);
 #endif
 
 int	hw_instruction_sse = 0;