diff --git a/builtin/providers/aws/resource_aws_db_instance.go b/builtin/providers/aws/resource_aws_db_instance.go
index 89a3945d9..7732689e1 100644
--- a/builtin/providers/aws/resource_aws_db_instance.go
+++ b/builtin/providers/aws/resource_aws_db_instance.go
@@ -637,6 +637,7 @@ func resourceAwsDbInstanceRead(d *schema.ResourceData, meta interface{}) error {
 	d.Set("engine", v.Engine)
 	d.Set("engine_version", v.EngineVersion)
 	d.Set("allocated_storage", v.AllocatedStorage)
+	d.Set("iops", v.Iops)
 	d.Set("copy_tags_to_snapshot", v.CopyTagsToSnapshot)
 	d.Set("auto_minor_version_upgrade", v.AutoMinorVersionUpgrade)
 	d.Set("storage_type", v.StorageType)
@@ -798,8 +799,10 @@ func resourceAwsDbInstanceUpdate(d *schema.ResourceData, meta interface{}) error
 	d.SetPartial("apply_immediately")
 
 	requestUpdate := false
-	if d.HasChange("allocated_storage") {
+	if d.HasChange("allocated_storage") || d.HasChange("iops") {
 		d.SetPartial("allocated_storage")
+		d.SetPartial("iops")
+		req.Iops = aws.Int64(int64(d.Get("iops").(int)))
 		req.AllocatedStorage = aws.Int64(int64(d.Get("allocated_storage").(int)))
 		requestUpdate = true
 	}
@@ -833,11 +836,6 @@ func resourceAwsDbInstanceUpdate(d *schema.ResourceData, meta interface{}) error
 		req.EngineVersion = aws.String(d.Get("engine_version").(string))
 		requestUpdate = true
 	}
-	if d.HasChange("iops") {
-		d.SetPartial("iops")
-		req.Iops = aws.Int64(int64(d.Get("iops").(int)))
-		requestUpdate = true
-	}
 	if d.HasChange("backup_window") {
 		d.SetPartial("backup_window")
 		req.PreferredBackupWindow = aws.String(d.Get("backup_window").(string))
@@ -918,9 +916,9 @@ func resourceAwsDbInstanceUpdate(d *schema.ResourceData, meta interface{}) error
 		requestUpdate = true
 	}
 
-	log.Printf("[DEBUG] Send DB Instance Modification request: %#v", requestUpdate)
+	log.Printf("[DEBUG] Send DB Instance Modification request: %t", requestUpdate)
 	if requestUpdate {
-		log.Printf("[DEBUG] DB Instance Modification request: %#v", req)
+		log.Printf("[DEBUG] DB Instance Modification request: %s", req)
 		_, err := conn.ModifyDBInstance(req)
 		if err != nil {
 			return fmt.Errorf("Error modifying DB Instance %s: %s", d.Id(), err)
diff --git a/builtin/providers/aws/resource_aws_db_instance_test.go b/builtin/providers/aws/resource_aws_db_instance_test.go
index 1398f82aa..5db77b14c 100644
--- a/builtin/providers/aws/resource_aws_db_instance_test.go
+++ b/builtin/providers/aws/resource_aws_db_instance_test.go
@@ -176,6 +176,43 @@ func TestAccAWSDBInstance_enhancedMonitoring(t *testing.T) {
 	})
 }
 
+// Regression test for https://github.com/hashicorp/terraform/issues/3760 .
+// We apply a plan, then change just the iops. If the apply succeeds, we
+// consider this a pass, as before in 3760 the request would fail
+func TestAccAWSDBInstance_iops_update(t *testing.T) {
+	var v rds.DBInstance
+
+	rName := acctest.RandString(5)
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckAWSDBInstanceDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccSnapshotInstanceConfig_iopsUpdate(rName, 1000),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSDBInstanceExists("aws_db_instance.bar", &v),
+					testAccCheckAWSDBInstanceAttributes(&v),
+				),
+			},
+
+			resource.TestStep{
+				Config: testAccSnapshotInstanceConfig_iopsUpdate(rName, 2000),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSDBInstanceExists("aws_db_instance.bar", &v),
+					testAccCheckAWSDBInstanceAttributes(&v),
+				),
+				// The plan will be non-empty because even with apply_immediatley, the
+				// instance has to apply the change via reboot, so follow up plans will
+				// show a non empty plan. The test is considered "successful" if the
+				// follow up change is applied at all.
+				ExpectNonEmptyPlan: true,
+			},
+		},
+	})
+}
+
 func testAccCheckAWSDBInstanceDestroy(s *terraform.State) error {
 	conn := testAccProvider.Meta().(*AWSClient).rdsconn
 
@@ -644,3 +681,23 @@ resource "aws_db_instance" "enhanced_monitoring" {
 	skip_final_snapshot = true
 }
 `
+
+func testAccSnapshotInstanceConfig_iopsUpdate(rName string, iops int) string {
+	return fmt.Sprintf(`
+resource "aws_db_instance" "bar" {
+  identifier           = "mydb-rds-%s"
+  engine               = "mysql"
+  engine_version       = "5.6.23"
+  instance_class       = "db.t2.micro"
+  name                 = "mydb"
+  username             = "foo"
+  password             = "barbarbar"
+  parameter_group_name = "default.mysql5.6"
+
+  apply_immediately = true
+
+  storage_type      = "io1"
+  allocated_storage = 200
+  iops              = %d
+}`, rName, iops)
+}