diff --git a/rtl/linux/Makefile b/rtl/linux/Makefile
index f39c7ba1e6..a2c4468a5b 100644
--- a/rtl/linux/Makefile
+++ b/rtl/linux/Makefile
@@ -1,5 +1,5 @@
 #
-# Makefile generated by fpcmake v0.99.15 [2000/06/03]
+# Makefile generated by fpcmake v0.99.15 [2000/06/16]
 #
 
 defaultrule: all
@@ -202,7 +202,7 @@ endif
 # Targets
 
 override LOADEROBJECTS+=prt0 cprt0 gprt0 cprt21 gprt21
-override UNITOBJECTS+=$(SYSTEMUNIT) objpas strings linux ports initc dos crt objects printer graph ggigraph sysutils typinfo math cpu mmx getopts heaptrc lineinfo errors sockets gpm ipc
+override UNITOBJECTS+=$(SYSTEMUNIT) objpas strings linux ports initc dos crt objects printer graph ggigraph sysutils typinfo math cpu mmx getopts heaptrc lineinfo errors sockets gpm ipc serial
 
 # Clean
 
diff --git a/rtl/linux/Makefile.fpc b/rtl/linux/Makefile.fpc
index 22635bf781..fee449ef22 100644
--- a/rtl/linux/Makefile.fpc
+++ b/rtl/linux/Makefile.fpc
@@ -9,7 +9,7 @@ units=$(SYSTEMUNIT) objpas strings \
       dos crt objects printer graph ggigraph \
       sysutils typinfo math \
       cpu mmx getopts heaptrc lineinfo \
-      errors sockets gpm ipc
+      errors sockets gpm ipc serial
 
 [require]
 rtl=0