diff --git a/bundles/core/org.eclipse.smarthome.core.thing/src/main/java/org/eclipse/smarthome/core/thing/binding/BaseThingHandlerFactory.java b/bundles/core/org.eclipse.smarthome.core.thing/src/main/java/org/eclipse/smarthome/core/thing/binding/BaseThingHandlerFactory.java
index de5c8968533..dc1d07f440e 100644
--- a/bundles/core/org.eclipse.smarthome.core.thing/src/main/java/org/eclipse/smarthome/core/thing/binding/BaseThingHandlerFactory.java
+++ b/bundles/core/org.eclipse.smarthome.core.thing/src/main/java/org/eclipse/smarthome/core/thing/binding/BaseThingHandlerFactory.java
@@ -102,7 +102,7 @@ public ThingHandler registerHandler(Thing thing) {
         }
         if ((thing instanceof Bridge) && !(thingHandler instanceof BridgeHandler)) {
             throw new IllegalStateException(
-                    "Created handler of bridge ' " + thing.getUID() + "' must implement the BridgeHandler interface.");
+                    "Created handler of bridge '" + thing.getUID() + "' must implement the BridgeHandler interface.");
         }
         setHandlerContext(thingHandler);
         registerConfigStatusProvider(thing, thingHandler);