diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 89e8016e6..2240424e1 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -602,6 +602,7 @@ bool cmSystemTools::RunCommand(const char* command,
     fgets(buffer, BUFFER_SIZE, cpipe);
     }
   fclose(cpipe);
+  return true;
 #endif
 }