diff --git a/MokManager.c b/MokManager.c
index 52f5c0a04..010180fd4 100644
--- a/MokManager.c
+++ b/MokManager.c
@@ -737,7 +737,7 @@ static EFI_STATUS compute_pw_hash(void *Data, UINTN DataSize, UINT8 * password,
 	return efi_status;
 }
 
-static INTN reset_system()
+static INTN reset_system(void)
 {
 	RT->ResetSystem(EfiResetWarm, EFI_SUCCESS, 0, NULL);
 	console_notify(L"Failed to reboot\n");
@@ -2152,7 +2152,7 @@ static BOOLEAN verify_pw(BOOLEAN * protected)
 	return TRUE;
 }
 
-static int draw_countdown()
+static int draw_countdown(void)
 {
 	CHAR16 *message = L"Press any key to perform MOK management";
 	CHAR16 *title;
diff --git a/sbat.c b/sbat.c
index f31d9454a..8f29e3982 100644
--- a/sbat.c
+++ b/sbat.c
@@ -456,7 +456,7 @@ preserve_ssp_uefi_variable(UINT8 *ssp_applied, UINTN sspversize, UINT32 attribut
 }
 
 static void
-clear_sbat_policy()
+clear_sbat_policy(void)
 {
 	EFI_STATUS efi_status = EFI_SUCCESS;