diff --git a/modules/mysql/read_replica.tf b/modules/mysql/read_replica.tf
index d0885cd2..2732471c 100644
--- a/modules/mysql/read_replica.tf
+++ b/modules/mysql/read_replica.tf
@@ -23,7 +23,7 @@ locals {
 }
 
 data "google_compute_zones" "available" {
-  count   = var.zone == null ? 0 : 1
+  count   = var.zone == null ? 1 : 0
   project = var.project_id
   region  = var.region
 }
diff --git a/modules/postgresql/read_replica.tf b/modules/postgresql/read_replica.tf
index 653c8569..03432672 100644
--- a/modules/postgresql/read_replica.tf
+++ b/modules/postgresql/read_replica.tf
@@ -23,7 +23,7 @@ locals {
 }
 
 data "google_compute_zones" "available" {
-  count   = var.zone == null ? 0 : 1
+  count   = var.zone == null ? 1 : 0
   project = var.project_id
   region  = var.region
 }