diff --git a/src/widgets/widgets/qwidgetlinecontrol.cpp b/src/widgets/widgets/qwidgetlinecontrol.cpp
index b094c114a8..754e4e339f 100644
--- a/src/widgets/widgets/qwidgetlinecontrol.cpp
+++ b/src/widgets/widgets/qwidgetlinecontrol.cpp
@@ -1208,44 +1208,44 @@ QString QWidgetLineControl::maskString(int pos, const QString &str, bool clear)
         if (strIndex < str.length()) {
             if (m_maskData[i].separator) {
                 s += m_maskData[i].maskChar;
-                if (str[(int)strIndex] == m_maskData[i].maskChar)
+                if (str[strIndex] == m_maskData[i].maskChar)
                     strIndex++;
                 ++i;
             } else {
-                if (isValidInput(str[(int)strIndex], m_maskData[i].maskChar)) {
+                if (isValidInput(str[strIndex], m_maskData[i].maskChar)) {
                     switch (m_maskData[i].caseMode) {
                     case MaskInputData::Upper:
-                        s += str[(int)strIndex].toUpper();
+                        s += str[strIndex].toUpper();
                         break;
                     case MaskInputData::Lower:
-                        s += str[(int)strIndex].toLower();
+                        s += str[strIndex].toLower();
                         break;
                     default:
-                        s += str[(int)strIndex];
+                        s += str[strIndex];
                     }
                     ++i;
                 } else {
                     // search for separator first
-                    int n = findInMask(i, true, true, str[(int)strIndex]);
+                    int n = findInMask(i, true, true, str[strIndex]);
                     if (n != -1) {
-                        if (str.length() != 1 || i == 0 || (i > 0 && (!m_maskData[i-1].separator || m_maskData[i-1].maskChar != str[(int)strIndex]))) {
+                        if (str.length() != 1 || i == 0 || (i > 0 && (!m_maskData[i-1].separator || m_maskData[i-1].maskChar != str[strIndex]))) {
                             s += QStringView{fill}.mid(i, n - i + 1);
                             i = n + 1; // update i to find + 1
                         }
                     } else {
                         // search for valid m_blank if not
-                        n = findInMask(i, true, false, str[(int)strIndex]);
+                        n = findInMask(i, true, false, str[strIndex]);
                         if (n != -1) {
                             s += QStringView{fill}.mid(i, n - i);
                             switch (m_maskData[n].caseMode) {
                             case MaskInputData::Upper:
-                                s += str[(int)strIndex].toUpper();
+                                s += str[strIndex].toUpper();
                                 break;
                             case MaskInputData::Lower:
-                                s += str[(int)strIndex].toLower();
+                                s += str[strIndex].toLower();
                                 break;
                             default:
-                                s += str[(int)strIndex];
+                                s += str[strIndex];
                             }
                             i = n + 1; // updates i to find + 1
                         }