diff --git a/otherlibs/threads/Makefile b/otherlibs/threads/Makefile
index 5e2232609..5535c6390 100644
--- a/otherlibs/threads/Makefile
+++ b/otherlibs/threads/Makefile
@@ -34,7 +34,8 @@ LIB_OBJS=pervasives.cmo \
   $(LIB)/printf.cmo $(LIB)/format.cmo $(LIB)/arg.cmo \
   $(LIB)/printexc.cmo $(LIB)/gc.cmo $(LIB)/digest.cmo $(LIB)/random.cmo \
   $(LIB)/oo.cmo $(LIB)/genlex.cmo $(LIB)/callback.cmo $(LIB)/weak.cmo \
-  $(LIB)/lazy.cmo $(LIB)/filename.cmo
+  $(LIB)/lazy.cmo $(LIB)/filename.cmo $(LIB)/int32.cmo $(LIB)/int64.cmo \
+  $(LIB)/nativeint.cmo
 
 all: libthreads.a threads.cma stdlib.cma