1 files changed, 3 insertions, 2 deletions
diff --git a/src/gui/util/qvalidator.cpp b/src/gui/util/qvalidator.cpp
index d0bd1cfc6d..3103cc7424 100644
--- a/src/gui/util/qvalidator.cpp
+++ b/src/gui/util/qvalidator.cpp
@@ -871,10 +871,11 @@ QRegExpValidator::~QRegExpValidator()
 
 QValidator::State QRegExpValidator::validate(QString &input, int& pos) const
 {
-    if (r.exactMatch(input)) {
+    QRegExp copy = r;
+    if (copy.exactMatch(input)) {
         return Acceptable;
     } else {
-        if (const_cast<QRegExp &>(r).matchedLength() == input.size()) {
+        if (copy.matchedLength() == input.size()) {
             return Intermediate;
         } else {
             pos = input.size();