diff --git a/compilerplugins/clang/stringconstant.cxx b/compilerplugins/clang/stringconstant.cxx
index 9c869218f6cb..5ffec1b21114 100644
--- a/compilerplugins/clang/stringconstant.cxx
+++ b/compilerplugins/clang/stringconstant.cxx
@@ -1191,7 +1191,7 @@ void StringConstant::handleOUStringCtor(
         && e3->getArg(0)->IgnoreParenImpCasts()->isIntegerConstantExpr(
             res, compiler.getASTContext()))
     {
-        if (res > 0 && res <= 127) {
+        if (res > static_cast<APSInt>(0) && res <= static_cast<APSInt>(127)) {
             report(
                 DiagnosticsEngine::Warning,
                 ("in call of %0, replace OUString constructed from a (non-NUL)"