diff --git a/drivers/isdn/hardware/mISDN/Makefile b/drivers/isdn/hardware/mISDN/Makefile
index 065f81e..a78fc75 100644
--- a/drivers/isdn/hardware/mISDN/Makefile
+++ b/drivers/isdn/hardware/mISDN/Makefile
@@ -44,6 +44,8 @@ endif
 #  endif
 #endif
 
+export-objs       := hisax_core.o
+
 obj-$(CONFIG_ISDN_DRV_NEWHISAX) :=
 obj-$(CONFIG_ISDN_DRV_NEWHISAX) += hisaxcore.o