diff --git a/azurerm/internal/services/iothub/iothub_resource.go b/azurerm/internal/services/iothub/iothub_resource.go
index 61e7c4a6658d3..1101a68d0ed87 100644
--- a/azurerm/internal/services/iothub/iothub_resource.go
+++ b/azurerm/internal/services/iothub/iothub_resource.go
@@ -366,6 +366,7 @@ func resourceArmIotHub() *schema.Resource {
 						"value": {
 							Type:     schema.TypeString,
 							Required: true,
+							ValidateFunc: validation.StringIsNotEmpty,
 						},
 						"endpoint_names": {
 							Type: schema.TypeList,