diff --git a/upb/message/accessors.h b/upb/message/accessors.h
index fb0f7aa657001..56f3850219137 100644
--- a/upb/message/accessors.h
+++ b/upb/message/accessors.h
@@ -147,6 +147,10 @@ UPB_API_INLINE void upb_Message_SetBaseFieldInt64(struct upb_Message* msg,
                                                   const upb_MiniTableField* f,
                                                   int64_t value);
 
+UPB_API_INLINE void upb_Message_SetBaseFieldMap(struct upb_Message* msg,
+                                                const upb_MiniTableField* f,
+                                                struct upb_Map* value);
+
 UPB_API_INLINE void upb_Message_SetBaseFieldMessage(struct upb_Message* msg,
                                                     const upb_MiniTableField* f,
                                                     upb_Message* value);
diff --git a/upb/message/internal/accessors.h b/upb/message/internal/accessors.h
index 03070007f67f2..2bffcea1d4bd6 100644
--- a/upb/message/internal/accessors.h
+++ b/upb/message/internal/accessors.h
@@ -615,6 +615,15 @@ UPB_API_INLINE void upb_Message_SetBaseFieldMessage(struct upb_Message* msg,
   upb_Message_SetBaseField(msg, f, &value);
 }
 
+UPB_API_INLINE void upb_Message_SetBaseFieldMap(struct upb_Message* msg,
+                                                const upb_MiniTableField* f,
+                                                struct upb_Map* value) {
+  UPB_ASSERT(upb_MiniTableField_IsMap(f));
+  UPB_ASSUME(UPB_PRIVATE(_upb_MiniTableField_GetRep)(f) ==
+             kUpb_FieldRep_NativePointer);
+  upb_Message_SetBaseField(msg, f, &value);
+}
+
 UPB_API_INLINE void upb_Message_SetBaseFieldString(struct upb_Message* msg,
                                                    const upb_MiniTableField* f,
                                                    upb_StringView value) {