diff --git a/modules/cloud-function/variables.tf b/modules/cloud-function/variables.tf
index 317be9e10..8f3eeb369 100644
--- a/modules/cloud-function/variables.tf
+++ b/modules/cloud-function/variables.tf
@@ -96,7 +96,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
 
diff --git a/modules/cloud-run/variables.tf b/modules/cloud-run/variables.tf
index 12556ef03..8029f1c41 100644
--- a/modules/cloud-run/variables.tf
+++ b/modules/cloud-run/variables.tf
@@ -85,7 +85,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
 
diff --git a/modules/cloudsql-instance/variables.tf b/modules/cloudsql-instance/variables.tf
index 712974982..858807aeb 100644
--- a/modules/cloudsql-instance/variables.tf
+++ b/modules/cloudsql-instance/variables.tf
@@ -110,7 +110,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
 
diff --git a/modules/data-catalog-policy-tag/variables.tf b/modules/data-catalog-policy-tag/variables.tf
index 065125194..2342e9474 100644
--- a/modules/data-catalog-policy-tag/variables.tf
+++ b/modules/data-catalog-policy-tag/variables.tf
@@ -67,7 +67,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
 
diff --git a/modules/gcs/variables.tf b/modules/gcs/variables.tf
index 2592295d6..2e1517234 100644
--- a/modules/gcs/variables.tf
+++ b/modules/gcs/variables.tf
@@ -110,7 +110,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
 
diff --git a/modules/iam-service-account/variables.tf b/modules/iam-service-account/variables.tf
index 5c4aaa2e9..a9f60bf23 100644
--- a/modules/iam-service-account/variables.tf
+++ b/modules/iam-service-account/variables.tf
@@ -99,7 +99,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
 
diff --git a/modules/net-vpc-peering/variables.tf b/modules/net-vpc-peering/variables.tf
index 0bc256939..8f5f15f67 100644
--- a/modules/net-vpc-peering/variables.tf
+++ b/modules/net-vpc-peering/variables.tf
@@ -49,6 +49,6 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }
diff --git a/modules/project/variables.tf b/modules/project/variables.tf
index 3dedbb53f..be388d604 100644
--- a/modules/project/variables.tf
+++ b/modules/project/variables.tf
@@ -216,7 +216,7 @@ variable "prefix" {
   default     = null
   validation {
     condition     = var.prefix != ""
-    error_message = "Prefix can not be empty, please use null instead."
+    error_message = "Prefix cannot be empty, please use null instead."
   }
 }