diff --git a/pkgs/build-support/fetchgit/nix-prefetch-git b/pkgs/build-support/fetchgit/nix-prefetch-git
index 79ab699bcc25..2a53fd94e7f2 100755
--- a/pkgs/build-support/fetchgit/nix-prefetch-git
+++ b/pkgs/build-support/fetchgit/nix-prefetch-git
@@ -161,6 +161,7 @@ checkout_hash(){
         hash=$(hash_from_ref "$ref")
     fi
 
+    [[ -z "$deepClone" ]] && \
     clean_git fetch ${builder:+--progress} --depth=1 origin "$hash" || \
     clean_git fetch -t ${builder:+--progress} origin || return 1