diff --git a/encoding/form/proto_decode.go b/encoding/form/proto_decode.go
index 0a817b30e..94b12d9c8 100644
--- a/encoding/form/proto_decode.go
+++ b/encoding/form/proto_decode.go
@@ -36,9 +36,10 @@ func populateFieldValues(v protoreflect.Message, fieldPath []string, values []st
 	var fd protoreflect.FieldDescriptor
 	for i, fieldName := range fieldPath {
 		fields := v.Descriptor().Fields()
-
-		if fd = fields.ByName(protoreflect.Name(fieldName)); fd == nil {
-			fd = fields.ByJSONName(fieldName)
+		if fd = getDescriptorByFieldAndName(fields, fieldName); fd == nil {
+			if len(fieldName) > 2 && strings.HasSuffix(fieldName, "[]") {
+				fd = getDescriptorByFieldAndName(fields, strings.TrimSuffix(fieldName, "[]"))
+			}
 			if fd == nil {
 				// ignore unexpected field.
 				return nil
@@ -72,6 +73,17 @@ func populateFieldValues(v protoreflect.Message, fieldPath []string, values []st
 	return populateField(fd, v, values[0])
 }
 
+func getDescriptorByFieldAndName(fields protoreflect.FieldDescriptors, fieldName string) protoreflect.FieldDescriptor {
+	var fd protoreflect.FieldDescriptor
+	if fd = fields.ByName(protoreflect.Name(fieldName)); fd == nil {
+		fd = fields.ByJSONName(fieldName)
+		if fd == nil {
+			return nil
+		}
+	}
+	return fd
+}
+
 func populateField(fd protoreflect.FieldDescriptor, v protoreflect.Message, value string) error {
 	val, err := parseField(fd, value)
 	if err != nil {