diff --git a/git-flow-completion.zsh b/git-flow-completion.zsh
index 1f3fa1e..cfa77ff 100644
--- a/git-flow-completion.zsh
+++ b/git-flow-completion.zsh
@@ -545,4 +545,6 @@ __git_command_successful () {
     return 0
 }
 
-zstyle ':completion:*:*:git:*' user-commands flow:'provide high-level repository operations'
+zstyle -g existing_user_commands ':completion:*:*:git:*' user-commands
+
+zstyle ':completion:*:*:git:*' user-commands $existing_user_commands flow:'provide high-level repository operations'