diff --git a/src/version.cc.in b/src/version.cc.in
index 8bd269d2..a54b202e 100644
--- a/src/version.cc.in
+++ b/src/version.cc.in
@@ -10,7 +10,7 @@ std::string GetVersionString() {
   std::stringstream ss;
   ss << "Window.js revision " << kGitHash;
   if (!kGitTag.empty()) {
-    ss << "version " << kGitTag;
+    ss << " version " << kGitTag;
   }
   return ss.str();
 }