diff --git a/cfg/qt.cfg b/cfg/qt.cfg
index 8aecd9edd..9c5c95324 100644
--- a/cfg/qt.cfg
+++ b/cfg/qt.cfg
@@ -3561,6 +3561,18 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- QByteArray https://doc.qt.io/qt-5/qbytearray.html -->
+  <!-- char QByteArray::at(int i) const -->
+  <function name="QByteArray::at">
+    <noreturn>false</noreturn>
+    <returnValue type="char"/>
+    <use-retval/>
+    <const/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+  </function>
   <!-- ##### Container ##### -->
   <container id="qtContainer" opLessAllowed="false" itEndPattern="&gt; :: iterator|const_iterator">
     <type templateParameter="0"/>
@@ -3664,6 +3676,27 @@
       <function name="crend" yields="end-iterator"/>
     </access>
   </container>
+  <container id="qtByteArray" startPattern="QByteArray" endPattern="" inherits="qtContainer" opLessAllowed="true" itEndPattern=":: iterator|const_iterator|reverse_iterator|const_reverse_iterator">
+    <size>
+      <function name="isNull" yields="empty"/>
+      <function name="resize" action="resize"/>
+      <function name="push_back" action="push"/>
+      <function name="push_front" action="push"/>
+      <function name="prepend" action="push"/>
+      <function name="shrink_to_fit" action="change-internal"/>
+      <function name="squeeze" action="change-internal"/>
+      <function name="reserve" action="change-internal"/>
+    </size>
+    <access indexOperator="array-like">
+      <function name="at" yields="at_index"/>
+      <function name="front" yields="item"/>
+      <function name="back" yields="item"/>
+      <function name="rbegin" yields="start-iterator"/>
+      <function name="crbegin" yields="start-iterator"/>
+      <function name="rend" yields="end-iterator"/>
+      <function name="crend" yields="end-iterator"/>
+    </access>
+  </container>
   <!-- TODO: Inheriting from qtList also inherits from qtContainer which sets "<type templateParameter="0"/>". This is not correct, but seems to do no harm. Currently this can not be unset. -->
   <container id="qtStringList" startPattern="QStringList" inherits="qtList" opLessAllowed="true" itEndPattern=":: iterator|const_iterator|reverse_iterator|const_reverse_iterator">
     <size>
diff --git a/test/cfg/qt.cpp b/test/cfg/qt.cpp
index 1f2bf6316..b0edfe3cb 100644
--- a/test/cfg/qt.cpp
+++ b/test/cfg/qt.cpp
@@ -44,6 +44,26 @@ QString::iterator QString3()
     return it;
 }
 
+void QByteArray1(QByteArray byteArrayArg)
+{
+    for (int i = 0; i <= byteArrayArg.size(); ++i) {
+        // cppcheck-suppress stlOutOfBounds
+        byteArrayArg[i] = 'x';
+    }
+
+    // cppcheck-suppress containerOutOfBoundsIndexExpression
+    byteArrayArg[byteArrayArg.length()] = 'a';
+    // cppcheck-suppress containerOutOfBoundsIndexExpression
+    byteArrayArg[byteArrayArg.count()] = 'b';
+    // cppcheck-suppress containerOutOfBoundsIndexExpression
+    printf("val: %c\n", byteArrayArg[byteArrayArg.size()]);
+
+    QByteArray byteArray1{'a', 'b'};
+    (void)byteArray1[1];
+    // cppcheck-suppress ignoredReturnValue
+    byteArray1.at(1);
+}
+
 void QList1(QList<int> intListArg)
 {
     for (int i = 0; i <= intListArg.size(); ++i) {