diff --git a/Source/DOH/Doh/base.c b/Source/DOH/Doh/base.c
index 5ef5b6fd1..58a8ec31f 100644
--- a/Source/DOH/Doh/base.c
+++ b/Source/DOH/Doh/base.c
@@ -61,6 +61,11 @@ DohCopy(const DOH *obj) {
     return (objinfo->doh_copy)(b);
 }
 
+void
+DohIncref(DOH *obj) {
+  Incref(obj);
+}
+
 /* -----------------------------------------------------------------------------
  * DohClear()
  * ----------------------------------------------------------------------------- */
diff --git a/Source/DOH/Include/doh.h b/Source/DOH/Include/doh.h
index 3ef22be2e..b2d3df6c7 100644
--- a/Source/DOH/Include/doh.h
+++ b/Source/DOH/Include/doh.h
@@ -67,6 +67,7 @@ extern int           DohDump(const DOH *obj, DOHFile *out);
 extern int           DohLen(const DOH *obj);
 extern int           DohHashval(const DOH *obj);
 extern int           DohCmp(const DOH *obj1, const DOH *obj2);
+extern void          DohIncref(DOH *obj);
 
 /* Mapping methods */