diff --git a/python/tidy.py b/python/tidy.py
index 23fcde6e1d2..2b3709f1ca7 100644
--- a/python/tidy.py
+++ b/python/tidy.py
@@ -199,7 +199,7 @@ def check_rust(file_name, contents):
         line = re.sub('^#[A-Za-z0-9\(\)\[\]_]*?$', '', line)
 
         match = re.search(r",[^\s]", line)
-        if match:
+        if match and '$' not in line:
             yield (idx + 1, "missing space after ,")
 
         if line_is_attribute(line):