diff --git a/src/include/86box/86box.h b/src/include/86box/86box.h
index 51f1dbcbc..7f7723bba 100644
--- a/src/include/86box/86box.h
+++ b/src/include/86box/86box.h
@@ -242,7 +242,7 @@ struct accelKey {
 	char desc[64];
 	char seq[64];
 };
-#define NUM_ACCELS 7
+#define NUM_ACCELS 8
 extern struct accelKey acc_keys[NUM_ACCELS];
 extern struct accelKey def_acc_keys[NUM_ACCELS];
 extern int FindAccelerator(const char *name);
diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 27124b9fd..568c84b36 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -1397,7 +1397,7 @@ MainWindow::eventFilter(QObject *receiver, QEvent *event)
 			}
 			if ((QKeySequence)(ke->key() | ke->modifiers()) == FindAcceleratorSeq("mute"))
 			{
-				ui->actionMute_Unmute->setShortcut(seq);
+				ui->actionMute_Unmute->trigger();
 			}
 
 			return true;