diff --git a/entrypoint.sh b/entrypoint.sh
index bcda0eb..995bf25 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -48,7 +48,7 @@ fi
 
 # Attach postgres cluster to the app if specified.
 if [ -n "$INPUT_POSTGRES" ]; then
-  flyctl postgres attach --postgres-app "$INPUT_POSTGRES" || true
+  flyctl postgres attach "$INPUT_POSTGRES" || true
 fi
 
 # Make some info available to the GitHub workflow.