diff --git a/bundles/org.openhab.core.model.script/src/org/openhab/core/model/script/actions/ScriptExecution.java b/bundles/org.openhab.core.model.script/src/org/openhab/core/model/script/actions/ScriptExecution.java
index 665c1e657d8..c235db29b69 100644
--- a/bundles/org.openhab.core.model.script/src/org/openhab/core/model/script/actions/ScriptExecution.java
+++ b/bundles/org.openhab.core.model.script/src/org/openhab/core/model/script/actions/ScriptExecution.java
@@ -46,7 +46,7 @@ public static Object callScript(String scriptName) throws ScriptExecutionExcepti
         ModelRepository repo = ScriptServiceUtil.getModelRepository();
         if (repo != null) {
             String scriptNameWithExt = scriptName;
-            if (scriptName.endsWith(Script.SCRIPT_FILEEXT)) {
+            if (!scriptName.endsWith(Script.SCRIPT_FILEEXT)) {
                 scriptNameWithExt = scriptName + "." + Script.SCRIPT_FILEEXT;
             }
             XExpression expr = (XExpression) repo.getModel(scriptNameWithExt);