diff --git a/unzip.cpp b/unzip.cpp
index 6756007..df09956 100644
--- a/unzip.cpp
+++ b/unzip.cpp
@@ -72,7 +72,7 @@
 
 static int CompressionRatio(int64_t uncompressed, int64_t compressed) {
   if (uncompressed == 0) return 0;
-  return (100LL * (uncompressed - compressed)) / uncompressed;
+  return static_cast<int>((100LL * (uncompressed - compressed)) / uncompressed);
 }
 
 static void MaybeShowHeader() {