diff --git a/azurerm/helpers/validate/database.go b/azurerm/helpers/validate/database.go
index bda83f52b22a..d79aa3abb502 100644
--- a/azurerm/helpers/validate/database.go
+++ b/azurerm/helpers/validate/database.go
@@ -12,10 +12,10 @@ func DatabaseCollation(i interface{}, k string) (warnings []string, errors []err
 		return
 	}
 
-	matched, _ := regexp.MatchString(`^[A-Za-z0-9_. ]+$`, v)
+	matched, _ := regexp.MatchString(`^[-A-Za-z0-9_. ]+$`, v)
 
 	if !matched {
-		errors = append(errors, fmt.Errorf("%s contains invalid characters, only underscores are supported, got %s", k, v))
+		errors = append(errors, fmt.Errorf("%s contains invalid characters, only alphanumeric, underscore, space or hyphen characters are supported, got %s", k, v))
 		return
 	}
 
diff --git a/azurerm/helpers/validate/database_test.go b/azurerm/helpers/validate/database_test.go
index 773ee5a203d0..01e748cc5f94 100644
--- a/azurerm/helpers/validate/database_test.go
+++ b/azurerm/helpers/validate/database_test.go
@@ -8,9 +8,13 @@ func TestDatabaseCollation(t *testing.T) {
 		Errors int
 	}{
 		{
-			Value:  "en-US",
+			Value:  "en@US",
 			Errors: 1,
 		},
+		{
+			Value:  "en-US",
+			Errors: 0,
+		},
 		{
 			Value:  "en_US",
 			Errors: 0,
diff --git a/azurerm/resource_arm_postgresql_database.go b/azurerm/resource_arm_postgresql_database.go
index c915f8a5afc6..12e60d6a0693 100644
--- a/azurerm/resource_arm_postgresql_database.go
+++ b/azurerm/resource_arm_postgresql_database.go
@@ -3,7 +3,6 @@ package azurerm
 import (
 	"fmt"
 	"log"
-	"strings"
 	"time"
 
 	"github.com/Azure/azure-sdk-for-go/services/postgresql/mgmt/2017-12-01/postgresql"
@@ -152,11 +151,7 @@ func resourceArmPostgreSQLDatabaseRead(d *schema.ResourceData, meta interface{})
 
 	if props := resp.DatabaseProperties; props != nil {
 		d.Set("charset", props.Charset)
-
-		if collation := props.Collation; collation != nil {
-			v := strings.Replace(*collation, "-", "_", -1)
-			d.Set("collation", v)
-		}
+		d.Set("collation", props.Collation)
 	}
 
 	return nil