diff --git a/tests/runtestfedabipkgdiff.py.in b/tests/runtestfedabipkgdiff.py.in
index 9777415f..15676a1e 100755
--- a/tests/runtestfedabipkgdiff.py.in
+++ b/tests/runtestfedabipkgdiff.py.in
@@ -131,7 +131,7 @@ def run_fedabipkgdiff_tests():
             subprocess.call(cmd, stdout=out_file)
 
             if not os.path.exists(reference_report_path):
-                sys.stderr.write('file not found: ' + reference_report_path)
+                sys.stderr.write('file not found: ' + reference_report_path + '\n')
                 return_code = -1
             else:
                 diffcmd = ['diff', '-u', reference_report_path, output_path]