diff --git a/pkgs/applications/networking/mumble/default.nix b/pkgs/applications/networking/mumble/default.nix
index 43f91c227027..cab3e4774bee 100644
--- a/pkgs/applications/networking/mumble/default.nix
+++ b/pkgs/applications/networking/mumble/default.nix
@@ -62,6 +62,7 @@ let
         cmakeFlags = [
           "-D g15=OFF"
           "-D CMAKE_CXX_STANDARD=17" # protobuf >22 requires C++ 17
+          "-D BUILD_NUMBER=${lib.versions.patch source.version}"
         ] ++ (overrides.configureFlags or [ ]);
 
         preConfigure = ''