diff --git a/digitalocean/resource_digitalocean_volume.go b/digitalocean/resource_digitalocean_volume.go
index 263e9ab9..2c868a34 100644
--- a/digitalocean/resource_digitalocean_volume.go
+++ b/digitalocean/resource_digitalocean_volume.go
@@ -34,10 +34,12 @@ func resourceDigitalOceanVolume() *schema.Resource {
 			},
 
 			"name": {
-				Type:         schema.TypeString,
-				Required:     true,
-				ForceNew:     true,
-				ValidateFunc: validation.StringMatch(regexp.MustCompile(`^[a-z0-9\-]+$`), "Names must be lowercase and be composed only of numbers, letters and \"-\"."),
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+				// Underscores (_) allowed for backwards compatibility.
+				// See: https://github.com/terraform-providers/terraform-provider-digitalocean/pull/404
+				ValidateFunc: validation.StringMatch(regexp.MustCompile(`^[a-z0-9\-_]+$`), "Names must be lowercase and be composed only of numbers, letters and \"-\"."),
 			},
 			"urn": {
 				Type:        schema.TypeString,