diff --git a/src/test/generate-sym-test.py b/src/test/generate-sym-test.py
index e97b6bbbd5..028d108bb5 100755
--- a/src/test/generate-sym-test.py
+++ b/src/test/generate-sym-test.py
@@ -66,7 +66,7 @@ print('''        {}
 }, symbols_from_source[] = {''')
 
 for dirpath, _, filenames in sorted(os.walk(sys.argv[2])):
-    for filename in filenames:
+    for filename in sorted(filenames):
         if not filename.endswith(".c") and not filename.endswith(".h"):
             continue
         with open(os.path.join(dirpath, filename), "r") as f: