diff --git a/modules/dnn/src/caffe/caffe_importer.cpp b/modules/dnn/src/caffe/caffe_importer.cpp
index 03dff96464..ffd35ec7fc 100644
--- a/modules/dnn/src/caffe/caffe_importer.cpp
+++ b/modules/dnn/src/caffe/caffe_importer.cpp
@@ -125,8 +125,8 @@ public:
         {
             const google::protobuf::UnknownField& field = unknownFields.field(i);
             CV_Assert(field.type() == google::protobuf::UnknownField::TYPE_GROUP);
-            std::string fieldName = field.group().field(0).length_delimited();
-            std::string fieldValue = field.group().field(1).length_delimited();
+            std::string fieldName(field.group().field(0).length_delimited());
+            std::string fieldValue(field.group().field(1).length_delimited());
             params.set(fieldName, fieldValue);
         }
     }
@@ -136,7 +136,7 @@ public:
         const Reflection *refl = msg.GetReflection();
         int type = field->cpp_type();
         bool isRepeated = field->is_repeated();
-        const std::string &name = field->name();
+        const std::string name(field->name());
 
         #define SET_UP_FILED(getter, arrayConstr, gtype)                                    \
             if (isRepeated) {                                                               \
@@ -184,15 +184,15 @@ public:
                 int size = refl->FieldSize(msg, field);
                 std::vector<cv::String> buf(size);
                 for (int i = 0; i < size; i++)
-                    buf[i] = refl->GetRepeatedEnum(msg, field, i)->name();
+                    buf[i] = std::string(refl->GetRepeatedEnum(msg, field, i)->name());
                 params.set(name, DictValue::arrayString(buf.begin(), size));
             }
             else {
-                params.set(name, refl->GetEnum(msg, field)->name());
+                params.set(name, std::string(refl->GetEnum(msg, field)->name()));
             }
             break;
         default:
-            CV_Error(Error::StsError, "Unknown type \"" + String(field->type_name()) + "\" in prototxt");
+            CV_Error(Error::StsError, "Unknown type \"" + String(std::string(field->type_name())) + "\" in prototxt");
             break;
         }
     }
@@ -212,7 +212,7 @@ public:
         {
             const FieldDescriptor *fd = msgDesc->field(fieldId);
 
-            if (!isInternal && !ends_with_param(fd->name()))
+            if (!isInternal && !ends_with_param(std::string(fd->name())))
                 continue;
 
             const google::protobuf::UnknownFieldSet& unknownFields = msgRefl->GetUnknownFields(msg);