diff --git a/pkgs/build-support/release/make-source-tarball.nix b/pkgs/build-support/release/make-source-tarball.nix
index 7c2d6ca7368..26c28eabb28 100644
--- a/pkgs/build-support/release/make-source-tarball.nix
+++ b/pkgs/build-support/release/make-source-tarball.nix
@@ -12,7 +12,7 @@ let
   versionSuffix =
     if officialRelease
     then ""
-    else if src ? rev then "-pre${toString src.rev}" else "";
+    else if src ? rev then "pre${toString src.rev}" else "";
 
 in