diff --git a/lib/jkqtplotter/jkqtpbaseplotterstyle.cpp b/lib/jkqtplotter/jkqtpbaseplotterstyle.cpp
index 2bb82f2a89..22a162f687 100644
--- a/lib/jkqtplotter/jkqtpbaseplotterstyle.cpp
+++ b/lib/jkqtplotter/jkqtpbaseplotterstyle.cpp
@@ -103,8 +103,8 @@ void JKQTBasePlotterStyle::loadSettings(const QSettings &settings, const QString
             QString kk=k;
             kk.remove(0, start.size());
             QString num="";
-            while (kk.front().isDigit()) {
-                num+=kk.front();
+            while (kk.at(0).isDigit()) {
+                num+=kk.at(0);
                 kk.remove(0, 1);
             }
             bool ok=false;
diff --git a/lib/jkqtplotter/jkqtplotterstyle.cpp b/lib/jkqtplotter/jkqtplotterstyle.cpp
index 174cd5cb46..f1648f92f3 100644
--- a/lib/jkqtplotter/jkqtplotterstyle.cpp
+++ b/lib/jkqtplotter/jkqtplotterstyle.cpp
@@ -84,8 +84,8 @@ void JKQTPlotterStyle::loadSettings(const QSettings &settings, const QString &gr
             QString kk=k;
             kk.remove(0, start.size());
             QString num="";
-            while (kk.front().isDigit()) {
-                num+=kk.front();
+            while (kk.at(0).isDigit()) {
+                num+=kk.at(0);
                 kk.remove(0, 1);
             }
             bool ok=false;