diff --git a/Source/cmLocalUnixMakefileGenerator.cxx b/Source/cmLocalUnixMakefileGenerator.cxx
index 1f4240cbf..fdbdda1ed 100644
--- a/Source/cmLocalUnixMakefileGenerator.cxx
+++ b/Source/cmLocalUnixMakefileGenerator.cxx
@@ -2209,6 +2209,7 @@ OutputBuildObjectFromSource(std::ostream& fout,
       if(shared)
         {
         flags += this->GetSafeDefinition("CMAKE_SHARED_LIBRARY_C_FLAGS");
+        flags += " ";
         flags += this->GetSafeDefinition("CMAKE_C_FLAGS");
         flags += " ";
         if(buildType.size())