diff --git a/tasmota/tasmota_xdrv_driver/xdrv_11_knx.ino b/tasmota/tasmota_xdrv_driver/xdrv_11_knx.ino
index c71a323e5..bb3d0ae71 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_11_knx.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_11_knx.ino
@@ -945,7 +945,7 @@ void HandleKNXConfiguration(void)
             "var GA_AREA=eb('GA_AREA');"
             "var GA_FDEF=eb('GA_FDEF');"
             "if(GA_FNUM!=null&&GA_FNUM.value=='0'&&GA_AREA.value=='0'&&GA_FDEF.value=='0'){"
-              "alert('" D_KNX_WARNING "');"
+              "alert(\"" D_KNX_WARNING "\");"
             "}"
           "}"
           "function CBwarning()"
@@ -954,7 +954,7 @@ void HandleKNXConfiguration(void)
             "var CB_AREA=eb('CB_AREA');"
             "var CB_FDEF=eb('CB_FDEF');"
             "if(CB_FNUM!=null&&CB_FNUM.value=='0'&&CB_AREA.value=='0'&&CB_FDEF.value=='0'){"
-              "alert('" D_KNX_WARNING "');"
+              "alert(\"" D_KNX_WARNING "\");"
             "}"
           "}"));
     WSContentSendStyle();