diff --git a/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/DraytonWiserThingHandler.java b/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/DraytonWiserThingHandler.java
index f34358a0e0ebe..be18371139925 100644
--- a/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/DraytonWiserThingHandler.java
+++ b/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/DraytonWiserThingHandler.java
@@ -49,7 +49,7 @@ public void dispose() {
         }
     }
 
-    private void startAutomaticRefresh() {
+    private synchronized void startAutomaticRefresh() {
         Bridge bridge = getBridge();
         if (bridge != null) {
             refreshJob = scheduler.scheduleWithFixedDelay(() -> {
diff --git a/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/HeatHubHandler.java b/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/HeatHubHandler.java
index 5f9989d347b47..8004b4e2a27ce 100644
--- a/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/HeatHubHandler.java
+++ b/addons/binding/org.openhab.binding.draytonwiser/src/main/java/org/openhab/binding/draytonwiser/handler/HeatHubHandler.java
@@ -115,7 +115,7 @@ public void initialize() {
         refresh();
     }
 
-    private void startAutomaticRefresh() {
+    private synchronized void startAutomaticRefresh() {
         Thing thing = getThing();
         if (thing != null) {
             refreshJob = scheduler.scheduleWithFixedDelay(() -> {