diff --git a/themes/agnoster.zsh-theme b/themes/agnoster.zsh-theme
index 5a44864db..32ced7747 100644
--- a/themes/agnoster.zsh-theme
+++ b/themes/agnoster.zsh-theme
@@ -94,9 +94,9 @@ prompt_git() {
     PL_BRANCH_CHAR=$'\ue0a0'         # 
   }
   local ref dirty mode repo_path
-  repo_path=$(git rev-parse --git-dir 2>/dev/null)
 
   if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
+    repo_path=$(git rev-parse --git-dir 2>/dev/null)
     dirty=$(parse_git_dirty)
     ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git rev-parse --short HEAD 2> /dev/null)"
     if [[ -n $dirty ]]; then