diff --git a/lib/hweight.c b/lib/hweight.c
index bc9b51b..2c819d6 100644
--- a/lib/hweight.c
+++ b/lib/hweight.c
@@ -23,11 +23,11 @@
 #if BITS_PER_LONG == 32
 	return hweight32((unsigned int)(w >> 32)) + hweight32((unsigned int)w);
 #else
-	uint64_t res = w - ((w >> 1) & 0x5555555555555555ul);
-	res = (res & 0x3333333333333333ul) + ((res >> 2) & 0x3333333333333333ul);
-	res = (res + (res >> 4)) & 0x0F0F0F0F0F0F0F0Ful;
+	uint64_t res = w - ((w >> 1) & 0x5555555555555555ULL);
+	res = (res & 0x3333333333333333ULL) + ((res >> 2) & 0x3333333333333333ULL);
+	res = (res + (res >> 4)) & 0x0F0F0F0F0F0F0F0FULL;
 	res = res + (res >> 8);
 	res = res + (res >> 16);
-	return (res + (res >> 32)) & 0x00000000000000FFul;
+	return (res + (res >> 32)) & 0x00000000000000FFULL;
 #endif
 }