diff --git a/src/schema/rules/files/raw/ieeg.yaml b/src/schema/rules/files/raw/ieeg.yaml
index 587f9bcbb8..8b2e1604d6 100644
--- a/src/schema/rules/files/raw/ieeg.yaml
+++ b/src/schema/rules/files/raw/ieeg.yaml
@@ -3,6 +3,7 @@ ieeg:
   suffixes:
     - ieeg
   extensions:
+    - .medd/
     - .mefd/
     - .json
     - .edf