diff --git a/src/blitter/ntapi_blt_alloc.c b/src/blitter/ntapi_blt_alloc.c
index 5508166..92a84e9 100644
--- a/src/blitter/ntapi_blt_alloc.c
+++ b/src/blitter/ntapi_blt_alloc.c
@@ -37,7 +37,10 @@ int32_t __fastcall __ntapi_blt_alloc(
 	size_t		ptrs,i;
 
 	/* alignment */
-	if ((params->block_size % sizeof(uintptr_t)) || (params->block_count % sizeof(uintptr_t)))
+	if (params->block_count % sizeof(uintptr_t))
+		return NT_STATUS_INVALID_PARAMETER;
+
+	else if (!params->region && (params->block_size % sizeof(uintptr_t)))
 		return NT_STATUS_INVALID_PARAMETER;
 
 	/* blt control block allocation */