diff --git a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
index 002fccba07a..3e0756b0e43 100644
--- a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
+++ b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
@@ -242,7 +242,7 @@ static void sm_performSaveYourself(QXcbSessionManager *sm)
         sm->appCommitData();
         if (sm_isshutdown && sm_cancel)
             break; // we cancelled the shutdown, no need to save state
-    // fall through
+    Q_FALLTHROUGH();
     case SmSaveLocal:
         sm->appSaveState();
         break;
diff --git a/src/plugins/sqldrivers/mysql/qsql_mysql.cpp b/src/plugins/sqldrivers/mysql/qsql_mysql.cpp
index 554f4d91a4b..12e15bfc47e 100644
--- a/src/plugins/sqldrivers/mysql/qsql_mysql.cpp
+++ b/src/plugins/sqldrivers/mysql/qsql_mysql.cpp
@@ -1451,7 +1451,7 @@ QString QMYSQLDriver::formatValue(const QSqlField &field, bool trimStrings) cons
             } else {
                 qWarning("QMYSQLDriver::formatValue: Database not open");
             }
-            // fall through
+            Q_FALLTHROUGH();
         default:
             r = QSqlDriver::formatValue(field, trimStrings);
         }
diff --git a/src/plugins/sqldrivers/odbc/qsql_odbc.cpp b/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
index 5a77c26b623..1b3a55d0962 100644
--- a/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
+++ b/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
@@ -1676,7 +1676,7 @@ bool QODBCResult::exec()
                                           ind);
                     break;
                 }
-            // fall through
+            Q_FALLTHROUGH();
             default: {
                 QByteArray &ba = tmpStorage[i];
                 if (*ind != SQL_NULL_DATA)
@@ -1769,7 +1769,7 @@ bool QODBCResult::exec()
                     }
                     break;
                 }
-                // fall through
+                Q_FALLTHROUGH();
             default: {
                 if (bindValueType(i) & QSql::Out)
                     values[i] = tmpStorage.at(i);