diff --git a/discovery/azure/azure.go b/discovery/azure/azure.go
index 2edaa2d9e..c7119f948 100644
--- a/discovery/azure/azure.go
+++ b/discovery/azure/azure.go
@@ -86,6 +86,9 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if err != nil {
 		return err
 	}
+	if c.SubscriptionID == "" {
+		return fmt.Errorf("Azure SD configuration requires a subscription_id")
+	}
 
 	return yaml_util.CheckOverflow(c.XXX, "azure_sd_config")
 }
diff --git a/discovery/openstack/openstack.go b/discovery/openstack/openstack.go
index 85a6aff10..ac7371db9 100644
--- a/discovery/openstack/openstack.go
+++ b/discovery/openstack/openstack.go
@@ -103,6 +103,9 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if c.Role == "" {
 		return fmt.Errorf("role missing (one of: instance, hypervisor)")
 	}
+	if c.Region == "" {
+		return fmt.Errorf("Openstack SD configuration requires a region")
+	}
 	return yaml_util.CheckOverflow(c.XXX, "openstack_sd_config")
 }