diff --git a/.unison/default.prf b/.unison/default.prf
index 616c9cf..3a359e6 100644
--- a/.unison/default.prf
+++ b/.unison/default.prf
@@ -19,6 +19,7 @@ ignore = Name lib
 ignore = Name .gradle
 ignore = Name .idea
 ignore = Name build
+ignore = Name _opam
 
 # Ignore list files
 ignore = Name *:Zone.Identifier