diff --git a/vp8/encoder/x86/quantize_ssse3.c b/vp8/encoder/x86/quantize_ssse3.c
index 448217ff4..14282db80 100644
--- a/vp8/encoder/x86/quantize_ssse3.c
+++ b/vp8/encoder/x86/quantize_ssse3.c
@@ -17,7 +17,7 @@
 #include <intrin.h>
 #pragma intrinsic(_BitScanReverse)
 static int bsr(int mask) {
-  int eob;
+  unsigned long eob;
   _BitScanReverse(&eob, mask);
   eob++;
   if (mask == 0)