diff --git a/snappy-stubs-internal.h b/snappy-stubs-internal.h
index c70a84a..3b7dd9e 100644
--- a/snappy-stubs-internal.h
+++ b/snappy-stubs-internal.h
@@ -469,7 +469,7 @@ inline int Bits::Log2FloorNonZero(uint32 n) {
 }
 
 inline int Bits::Log2Floor(uint32 n) {
-  return (n == 0) ? -1 : Bits::Log2FloorNonZero(arg);
+  return (n == 0) ? -1 : Bits::Log2FloorNonZero(n);
 }
 
 inline int Bits::FindLSBSetNonZero(uint32 n) {