diff --git a/internal/services/eventgrid/event_subscription_funcs.go b/internal/services/eventgrid/event_subscription_funcs.go
index 2945d377f670..fc5c60a013f8 100644
--- a/internal/services/eventgrid/event_subscription_funcs.go
+++ b/internal/services/eventgrid/event_subscription_funcs.go
@@ -793,7 +793,7 @@ func flattenRangeValues(inputKey *string, inputValues *[][]any) map[string]any {
 	values := make([]any, 0)
 	if inputValues != nil {
 		for _, item := range *inputValues {
-			values = append(values, item...)
+			values = append(values, item)
 		}
 	}