diff --git a/fallback.c b/fallback.c
index c3f5583..5a4bfff 100644
--- a/fallback.c
+++ b/fallback.c
@@ -983,7 +983,7 @@ debug_hook(void)
 	UINT8 *data = NULL;
 	UINTN dataSize = 0;
 	EFI_STATUS efi_status;
-	volatile register int x = 0;
+	register volatile int x = 0;
 	extern char _etext, _edata;
 
 	efi_status = get_variable(L"SHIM_DEBUG", &data, &dataSize,
diff --git a/shim.c b/shim.c
index b35b0ad..0e7e784 100644
--- a/shim.c
+++ b/shim.c
@@ -2559,7 +2559,7 @@ debug_hook(void)
 	UINT8 *data = NULL;
 	UINTN dataSize = 0;
 	EFI_STATUS efi_status;
-	volatile register UINTN x = 0;
+	register volatile UINTN x = 0;
 	extern char _text, _data;
 
 	if (x)