diff --git a/cmake/utils.cmake b/cmake/utils.cmake
index 0b8333a..6898485 100644
--- a/cmake/utils.cmake
+++ b/cmake/utils.cmake
@@ -66,7 +66,7 @@ macro (gflags_define type varname docstring default)
   endif ()
   if (NOT DEFINED GFLAGS_${varname})
     if (DEFINED ${varname})
-      set(GFLAGS_${varname} "${${varname}}")
+      set (GFLAGS_${varname} "${${varname}}")
     else ()
       if (GFLAGS_IS_SUBPROJECT AND "${ARGC}" EQUAL 5)
         set (GFLAGS_${varname} "${ARGV4}")