diff --git a/passes/opt/Makefile.inc b/passes/opt/Makefile.inc
index 1d7833b31..e7b62fc6a 100644
--- a/passes/opt/Makefile.inc
+++ b/passes/opt/Makefile.inc
@@ -23,7 +23,6 @@ OBJS += passes/opt/opt_ffinv.o
 OBJS += passes/opt/pmux2shiftx.o
 OBJS += passes/opt/muxpack.o
 OBJS += passes/opt/opt_balance_tree.o
-OBJS += passes/opt/csa_tree.o
 
 OBJS += passes/opt/peepopt.o
 GENFILES += passes/opt/peepopt_pm.h
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index 083778d3c..190b93570 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -55,6 +55,7 @@ OBJS += passes/techmap/extractinv.o
 OBJS += passes/techmap/cellmatch.o
 OBJS += passes/techmap/clockgate.o
 OBJS += passes/techmap/constmap.o
+OBJS += passes/techmap/csa_tree.o
 endif
 
 ifeq ($(DISABLE_SPAWN),0)
diff --git a/passes/opt/csa_tree.cc b/passes/techmap/csa_tree.cc
similarity index 100%
rename from passes/opt/csa_tree.cc
rename to passes/techmap/csa_tree.cc