diff --git a/src/Utils.cpp b/src/Utils.cpp
index 3d56946..308b082 100644
--- a/src/Utils.cpp
+++ b/src/Utils.cpp
@@ -306,15 +306,13 @@
         std::string replaced(find.begin(), find.end());
         while (exprBegin != exprEnd)
         {
-            replaced += " ";
-            replaced += *exprBegin++;
+            replaced.append(" ").append(*exprBegin++);
         }
-
         ret = replaced;
 
         while (exprEnd != split.end())
         {
-            result += " " + *exprEnd++;
+            result.append(" ").append(*exprEnd++);
         }
         keyPair.value() = result;