diff --git a/passes/hierarchy/Makefile.inc b/passes/hierarchy/Makefile.inc
index 3cd1b6180..ff1a2fcc5 100644
--- a/passes/hierarchy/Makefile.inc
+++ b/passes/hierarchy/Makefile.inc
@@ -1,4 +1,5 @@
 
+OBJS += passes/hierarchy/flatten.o
 OBJS += passes/hierarchy/hierarchy.o
 OBJS += passes/hierarchy/uniquify.o
 OBJS += passes/hierarchy/submod.o
diff --git a/passes/techmap/flatten.cc b/passes/hierarchy/flatten.cc
similarity index 100%
rename from passes/techmap/flatten.cc
rename to passes/hierarchy/flatten.cc
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index 4e1d16744..13d4ad1b7 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -1,5 +1,4 @@
 
-OBJS += passes/techmap/flatten.o
 OBJS += passes/techmap/techmap.o
 OBJS += passes/techmap/simplemap.o
 OBJS += passes/techmap/dfflibmap.o