diff --git a/src/google/protobuf/compiler/rust/message.cc b/src/google/protobuf/compiler/rust/message.cc
index 65c176bc3d..548ac0e600 100644
--- a/src/google/protobuf/compiler/rust/message.cc
+++ b/src/google/protobuf/compiler/rust/message.cc
@@ -739,7 +739,7 @@ void MessageProxiedInMapValue(Context& ctx, const Descriptor& msg) {
 
 void GenerateRs(Context& ctx, const Descriptor& msg) {
   if (msg.map_key() != nullptr) {
-    ABSL_LOG(WARNING) << "unsupported map field: " << msg.full_name();
+    // Don't generate code for synthetic MapEntry messages.
     return;
   }
   ctx.Emit(