diff --git a/openstack/networking/v2/extensions/lbaas/monitors/requests.go b/openstack/networking/v2/extensions/lbaas/monitors/requests.go
index 9f8ac9a..bbcce23 100644
--- a/openstack/networking/v2/extensions/lbaas/monitors/requests.go
+++ b/openstack/networking/v2/extensions/lbaas/monitors/requests.go
@@ -64,6 +64,7 @@
 	errMaxRetriesRequired    = fmt.Errorf("MaxRetries is required")
 	errURLPathRequired       = fmt.Errorf("URL path is required")
 	errExpectedCodesRequired = fmt.Errorf("ExpectedCodes is required")
+	errDelayMustGETimeout    = fmt.Errorf("Delay must be greater than or equal to timeout")
 )
 
 // CreateOpts contains all the values needed to create a new health monitor.
@@ -141,6 +142,9 @@
 			res.Err = errExpectedCodesRequired
 		}
 	}
+	if opts.Delay < opts.Timeout {
+		res.Err = errDelayMustGETimeout
+	}
 	if res.Err != nil {
 		return res
 	}
@@ -227,6 +231,12 @@
 
 // Update is an operation which modifies the attributes of the specified monitor.
 func Update(c *gophercloud.ServiceClient, id string, opts UpdateOpts) UpdateResult {
+	var res UpdateResult
+
+	if opts.Delay > 0 && opts.Timeout > 0 && opts.Delay < opts.Timeout {
+		res.Err = errDelayMustGETimeout
+	}
+
 	type monitor struct {
 		Delay         int     `json:"delay"`
 		Timeout       int     `json:"timeout"`
@@ -251,8 +261,6 @@
 		AdminStateUp:  opts.AdminStateUp,
 	}}
 
-	var res UpdateResult
-
 	_, res.Err = perigee.Request("PUT", resourceURL(c, id), perigee.Options{
 		MoreHeaders: c.Provider.AuthenticatedHeaders(),
 		ReqBody:     &reqBody,
diff --git a/openstack/networking/v2/extensions/lbaas/monitors/requests_test.go b/openstack/networking/v2/extensions/lbaas/monitors/requests_test.go
index 5c5a1d2..79a99bf 100644
--- a/openstack/networking/v2/extensions/lbaas/monitors/requests_test.go
+++ b/openstack/networking/v2/extensions/lbaas/monitors/requests_test.go
@@ -100,6 +100,30 @@
 	}
 }
 
+func TestDelayMustBeGreaterOrEqualThanTimeout(t *testing.T) {
+	_, err := Create(fake.ServiceClient(), CreateOpts{
+		Type:          "HTTP",
+		Delay:         1,
+		Timeout:       10,
+		MaxRetries:    5,
+		URLPath:       "/check",
+		ExpectedCodes: "200-299",
+	}).Extract()
+
+	if err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+
+	_, err = Update(fake.ServiceClient(), "453105b9-1754-413f-aab1-55f1af620750", UpdateOpts{
+		Delay:   1,
+		Timeout: 10,
+	}).Extract()
+
+	if err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+}
+
 func TestCreate(t *testing.T) {
 	th.SetupHTTP()
 	defer th.TeardownHTTP()