diff --git a/python/google/protobuf/pyext/descriptor_pool.cc b/python/google/protobuf/pyext/descriptor_pool.cc
index d330e0d6f4d7..b607956de451 100644
--- a/python/google/protobuf/pyext/descriptor_pool.cc
+++ b/python/google/protobuf/pyext/descriptor_pool.cc
@@ -219,7 +219,7 @@ static int GcClear(PyObject* pself) {
 }
 
 PyObject* SetErrorFromCollector(DescriptorPool::ErrorCollector* self,
-                                char* name, char* error_type) {
+                                const char* name, const char* error_type) {
   BuildFileErrorCollector* error_collector =
       reinterpret_cast<BuildFileErrorCollector*>(self);
   if (error_collector && !error_collector->error_message.empty()) {