diff --git a/inc/gchtfinddefs.h b/inc/gchtfinddefs.h
index 655c065..e648a2d 100644
--- a/inc/gchtfinddefs.h
+++ b/inc/gchtfinddefs.h
@@ -3,4 +3,5 @@
 void enter_big_reference_count(LispPTR ptr);
 void modify_big_reference_count(LispPTR *entry, DLword casep, LispPTR ptr);
 LispPTR htfind(LispPTR ptr, int casep);
+LispPTR rec_htfind(LispPTR ptr, int casep);
 #endif