diff --git a/pylib/gyp/generator/msvs.py b/pylib/gyp/generator/msvs.py
index 0f14c055..42bee33d 100644
--- a/pylib/gyp/generator/msvs.py
+++ b/pylib/gyp/generator/msvs.py
@@ -857,7 +857,7 @@ def _EscapeCommandLineArgumentForMSBuild(s):
     """Escapes a Windows command-line argument for use by MSBuild."""
 
     def _Replace(match):
-        return (len(match.group(1)) / 2 * 4) * "\\" + '\\"'
+        return (len(match.group(1)) // 2 * 4) * "\\" + '\\"'
 
     # Escape all quotes so that they are interpreted literally.
     s = quote_replacer_regex2.sub(_Replace, s)