diff --git a/Source/cmake.h b/Source/cmake.h
index 376a71d5d..53f2b0767 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -120,7 +120,7 @@ class cmake
    * Handle a command line invocation of cmake.
    */
   int Run(const std::vector<std::string>&args)
-    { this->Run(args, false); }
+    { return this->Run(args, false); }
   int Run(const std::vector<std::string>&args, bool noconfigure);
 
   /**