diff --git a/postfix.yaml b/postfix.yaml
index 5a3cb00..ed58b00 100644
--- a/postfix.yaml
+++ b/postfix.yaml
@@ -9,7 +9,7 @@ data:
         buildrequires:
             base-runtime: f26
             # dependency on perl-generators
-            perl: master
+            perl: f26
             # add dependency because of mariadb, postgresql, tinycdb
             common-build-dependencies: f26
             #common-build-dependencies-bootstrap: f26