diff --git a/src/options.mk b/src/options.mk
index 85e6393..5a5a825 100644
--- a/src/options.mk
+++ b/src/options.mk
@@ -132,8 +132,8 @@ OPACK_GCE_BUCKET?=$(OPACK_GCE_PROJECT)
 # OPACK_GCE_REGION: The Google Cloud Compute Engine region.
 OPACK_GCE_REGION?=europe-west4
 
-# OPACK_GCE_REGION: The Google Cloud Compute Engine zone.
-OPACK_GCE_REGION?=europe-west4-b
+# OPACK_GCE_ZONE: The Google Cloud Compute Engine zone.
+OPACK_GCE_ZONE?=europe-west4-b
 
 # Define the machine type for the VM
 OPACK_GCE_MACHINE?=e2-micro