diff --git a/solutions/apps/variables.tf b/solutions/apps/variables.tf
index 560434e6..d2dc3c7a 100644
--- a/solutions/apps/variables.tf
+++ b/solutions/apps/variables.tf
@@ -54,8 +54,8 @@ variable "prefix" {
 
 variable "existing_resource_group_name" {
   type        = string
-  description = "The name of an existing resource group to provision the resources."
-  default     = "Default"
+  description = "The name of an existing resource group to provision the resources. If not provided the default resource group will be used."
+  default     = null
 }
 
 variable "project_name" {
diff --git a/solutions/project/variables.tf b/solutions/project/variables.tf
index 15596e3f..464a861c 100644
--- a/solutions/project/variables.tf
+++ b/solutions/project/variables.tf
@@ -54,8 +54,8 @@ variable "region" {
 
 variable "existing_resource_group_name" {
   type        = string
-  description = "The name of an existing resource group to provision the resources."
-  default     = "Default"
+  description = "The name of an existing resource group to provision the resources. If not provided the default resource group will be used."
+  default     = null
 }
 
 variable "project_name" {