diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index cf9e198ad..561636080 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -37,6 +37,7 @@ OBJS += passes/techmap/attrmap.o
 OBJS += passes/techmap/zinit.o
 OBJS += passes/techmap/dff2dffs.o
 OBJS += passes/techmap/flowmap.o
+OBJS += passes/techmap/muxpack.o
 endif
 
 GENFILES += passes/techmap/techmap.inc