diff --git a/lib/bitmap.c b/lib/bitmap.c
index 324ea9e..ee598a4 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1006,9 +1006,9 @@
  * All bits in @dst not set by the above rule are cleared.
  */
 void bitmap_onto(unsigned long *dst, const unsigned long *orig,
-			const unsigned long *relmap, int bits)
+			const unsigned long *relmap, unsigned int bits)
 {
-	int n, m;       	/* same meaning as in above comment */
+	unsigned int n, m;	/* same meaning as in above comment */
 
 	if (dst == orig)	/* following doesn't handle inplace mappings */
 		return;