diff --git a/_test/gke.sh b/_test/gke.sh
index 8b2c2f792a..53a72632f1 100644
--- a/_test/gke.sh
+++ b/_test/gke.sh
@@ -4,7 +4,7 @@ function gke-install {
     curl https://sdk.cloud.google.com | bash
   fi
 
-  export PATH="{GOOGLE_SDK_DIR}/bin:$PATH"
+  export PATH="${GOOGLE_SDK_DIR}/bin:$PATH"
   gcloud -q components update kubectl
 }