diff --git a/tools/semgrep-py.yml b/tools/semgrep-py.yml
index 535b3b9cb8..d3fb6b352d 100644
--- a/tools/semgrep-py.yml
+++ b/tools/semgrep-py.yml
@@ -54,6 +54,7 @@ rules:
 
   - id: dont-import-models-in-migrations
     patterns:
+      - pattern-not: from zerver.lib.mime_types import guess_type
       - pattern-not: from zerver.lib.redis_utils import get_redis_client
       - pattern-not: from zerver.lib.utils import generate_api_key
       - pattern-not: from zerver.models.linkifiers import filter_pattern_validator