diff --git a/src/blitter/ntapi_blt_alloc.c b/src/blitter/ntapi_blt_alloc.c
index e010441..52397d5 100644
--- a/src/blitter/ntapi_blt_alloc.c
+++ b/src/blitter/ntapi_blt_alloc.c
@@ -15,7 +15,8 @@
 static int __blt_popcount(uintptr_t mask)
 {
 	/* todo: check cpuid, use at_popcount */
-	int i,ret;
+	uintptr_t i;
+	int       ret;
 
 	for (i=0,ret=0; i<8*sizeof(uintptr_t); i++)
 		if (mask & ((uintptr_t)1<<i))