diff --git a/shim.h b/shim.h
index 86da132..b917ea2 100644
--- a/shim.h
+++ b/shim.h
@@ -5,7 +5,7 @@ INTERFACE_DECL(_SHIM_LOCK);
 
 typedef
 EFI_STATUS
-(EFIAPI *EFI_SHIM_LOCK_VERIFY) (
+(*EFI_SHIM_LOCK_VERIFY) (
 	IN VOID *buffer,
 	IN UINT32 size
 	);