diff --git a/functions-common b/functions-common
index 48edba8da6..818e165df7 100644
--- a/functions-common
+++ b/functions-common
@@ -575,7 +575,7 @@ function git_clone {
 
     RECLONE=$(trueorfalse False $RECLONE)
 
-    if [[ "$GIT_DEPTH" ]]; then
+    if [[ -n "${GIT_DEPTH}" ]]; then
         git_clone_flags="$git_clone_flags --depth $GIT_DEPTH"
     fi