diff --git a/postfix.yaml b/postfix.yaml
index d69c525..cf1ec35 100644
--- a/postfix.yaml
+++ b/postfix.yaml
@@ -11,10 +11,14 @@ data:
             # dependency on perl-generators
             perl: master
             # add dependency because of mariadb, postgresql, tinycdb
+            common-build-dependencies: master
             common-build-dependencies-bootstrap: master
+            shared-userspace: f26
+            postgresql: f26
         requires:
             base-runtime: master
             perl: master
+            postgresql: f26
     references:
         community: https://fedoraproject.org/wiki/Modularity
         documentation: https://fedoraproject.org/wiki/Fedora_Packaging_Guidelines_for_Modules
@@ -32,12 +36,6 @@ data:
                 rationale: A dependency of tangerine.
                 ref: f26
                 buildorder: 10
-            mariadb:
-                rationale: build dep of postfix
-                ref: master
-            postgresql:
-                rationale: build dep of postfix
-                ref: master
             tinycdb:
-                rationale: build dep of postfix
-                ref: master
+                rationale: A dependency of tangerine.
+                ref: f26