diff --git a/CommandLine/CommandLine.swift b/CommandLine/CommandLine.swift
index 0494e83..1c8b889 100644
--- a/CommandLine/CommandLine.swift
+++ b/CommandLine/CommandLine.swift
@@ -161,9 +161,7 @@ public class CommandLine {
           continue
         }
         
-        // Swift 1.2: String.append() doesn't like emoji for some reason, seems
-        // like a bug. Same workaround in String extension splitByCharacter()
-        flag = flag + String(c)
+        flag.append(c)
       }
       
       /* Remove attached argument from flag */
diff --git a/CommandLine/StringExtensions.swift b/CommandLine/StringExtensions.swift
index fd9d106..946c0fc 100644
--- a/CommandLine/StringExtensions.swift
+++ b/CommandLine/StringExtensions.swift
@@ -95,7 +95,7 @@ internal extension String {
         continue
       }
       
-      buf = buf + String(c)
+      buf.append(c)
     }
     
     if count(buf) > 0 {