diff --git a/upb/mini_table/extension.h b/upb/mini_table/extension.h
index 7df685db98..f7656ada44 100644
--- a/upb/mini_table/extension.h
+++ b/upb/mini_table/extension.h
@@ -12,6 +12,7 @@
 
 #include "upb/base/descriptor_constants.h"
 #include "upb/mini_table/enum.h"
+#include "upb/mini_table/field.h"
 #include "upb/mini_table/internal/extension.h"
 #include "upb/mini_table/message.h"
 
@@ -45,6 +46,9 @@ UPB_API_INLINE bool upb_MiniTableExtension_SetSubMessage(
 UPB_API_INLINE bool upb_MiniTableExtension_SetSubEnum(
     upb_MiniTableExtension* e, const upb_MiniTableEnum* m);
 
+UPB_API_INLINE const upb_MiniTableField* upb_MiniTableExtension_ToField(
+    const upb_MiniTableExtension* e);
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif
diff --git a/upb/mini_table/internal/extension.h b/upb/mini_table/internal/extension.h
index 3a794851c8..630492519b 100644
--- a/upb/mini_table/internal/extension.h
+++ b/upb/mini_table/internal/extension.h
@@ -81,6 +81,11 @@ UPB_API_INLINE bool upb_MiniTableExtension_SetSubEnum(
   return true;
 }
 
+UPB_API_INLINE const upb_MiniTableField* upb_MiniTableExtension_ToField(
+    const struct upb_MiniTableExtension* e) {
+  return &e->UPB_PRIVATE(field);
+}
+
 UPB_INLINE upb_FieldRep UPB_PRIVATE(_upb_MiniTableExtension_GetRep)(
     const struct upb_MiniTableExtension* e) {
   return UPB_PRIVATE(_upb_MiniTableField_GetRep)(&e->UPB_PRIVATE(field));