diff --git a/common/memory.h b/common/memory.h
index cefbf82..e71dc99 100644
--- a/common/memory.h
+++ b/common/memory.h
@@ -16,6 +16,11 @@
  * limitations under the License.
  */
 
+#ifndef MEMORY_H_
+#define MEMORY_H_
+
+#include <string>
+
 enum
 {
   MEMORY_MODE_DEFAULT,
@@ -23,11 +28,6 @@ enum
   MEMORY_MODE_USAGE_PERCENTAGE
 };
 
-#ifndef MEMORY_H_
-#define MEMORY_H_
-
-#include <string>
-
 std::string mem_string( bool, int );
 
 #endif