diff --git a/misc/yap.def b/misc/yap.def
index e927d8e16..4c825ea47 100644
--- a/misc/yap.def
+++ b/misc/yap.def
@@ -7,7 +7,7 @@ YapReset
 Deref
 YapIsVarTerm
 YapIsNonVarTerm
-MkVarTerm
+YapMkVarTerm
 YapIsIntTerm
 YapIsFloatTerm
 YapIsDbRefTerm