diff --git a/src/Init/Data/Array.lean b/src/Init/Data/Array.lean
index daaced8f1c..d26bc11b7a 100644
--- a/src/Init/Data/Array.lean
+++ b/src/Init/Data/Array.lean
@@ -9,3 +9,4 @@ import Init.Data.Array.QSort
 import Init.Data.Array.BinSearch
 import Init.Data.Array.InsertionSort
 import Init.Data.Array.DecidableEq
+import Init.Data.Array.Mem