1 files changed, 1 insertions, 1 deletions
diff --git a/lz4.c b/lz4.c
index 9439b36..fb84955 100644
--- a/lz4.c
+++ b/lz4.c
@@ -369,7 +369,7 @@ static unsigned LZ4_NbCommonBytes (register size_t val)
         {
 #       if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
             unsigned long r = 0;
-            _BitScanReverse( &r, val );
+            _BitScanReverse( &r, (unsigned long)val );
             return (unsigned)(r>>3);
 #       elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
             return (__builtin_clz(val) >> 3);