diff --git a/src/kconfig_compiler/kconfig_compiler.cpp b/src/kconfig_compiler/kconfig_compiler.cpp
--- a/src/kconfig_compiler/kconfig_compiler.cpp
+++ b/src/kconfig_compiler/kconfig_compiler.cpp
@@ -616,10 +616,12 @@
 static QString literalString(const QString &s)
 {
     bool isAscii = true;
-    for (int i = s.length(); i--;)
+    for (int i = s.length(); i--;) {
         if (s[i].unicode() > 127) {
             isAscii = false;
+            break;
         }
+    }
 
     if (isAscii) {
         return QLatin1String("QStringLiteral( ") + quoteString(s) + QLatin1String(" )");