diff --git a/azurerm/resource_arm_snapshot.go b/azurerm/resource_arm_snapshot.go
index ce1579632fb8..1652acdf66a8 100644
--- a/azurerm/resource_arm_snapshot.go
+++ b/azurerm/resource_arm_snapshot.go
@@ -216,10 +216,10 @@ func resourceArmSnapshotDelete(d *schema.ResourceData, meta interface{}) error {
 }
 
 func validateSnapshotName(v interface{}, k string) (ws []string, errors []error) {
-	// a-z, A-Z, 0-9 and _. The max name length is 80
+	// a-z, A-Z, 0-9, _ and -. The max name length is 80
 	value := v.(string)
 
-	r, _ := regexp.Compile("^[A-Za-z0-9_]+$")
+	r, _ := regexp.Compile("^[A-Za-z0-9_-]+$")
 	if !r.MatchString(value) {
 		errors = append(errors, fmt.Errorf("Snapshot Names can only contain alphanumeric characters and underscores."))
 	}