diff --git a/dojo/tools/zap/parser.py b/dojo/tools/zap/parser.py
index 19fbf16241e..88d09ccb66e 100644
--- a/dojo/tools/zap/parser.py
+++ b/dojo/tools/zap/parser.py
@@ -27,6 +27,9 @@ def get_description_for_scan_types(self, scan_type):
         return "ZAP XML report format."
 
     def get_findings(self, file, test):
+        if not file.name.endswith(".xml"):
+            msg = "Internal error: Wrong file format, please use xml."
+            raise ValueError(msg)
         tree = ET.parse(file)
         items = []
         for node in tree.findall("site"):