diff --git a/sw/sw.mk b/sw/sw.mk
index da518442..9f599cf1 100644
--- a/sw/sw.mk
+++ b/sw/sw.mk
@@ -76,13 +76,13 @@ $$(CHS_SW_DIR)/include/regs/$(1).h: $(2)
 	$$(REGTOOL) --cdefines $$< > $$@
 endef
 
-$(eval $(call chs_sw_gen_hdr_rule,clint,$(CLINTROOT)/src/clint.hjson $(CLINTROOT)/.generated))
-$(eval $(call chs_sw_gen_hdr_rule,serial_link,$(CHS_ROOT)/hw/serial_link.hjson $(CHS_SLINK_DIR)/.generated))
-$(eval $(call chs_sw_gen_hdr_rule,axi_vga,$(AXI_VGA_ROOT)/data/axi_vga.hjson $(AXI_VGA_ROOT)/.generated))
+$(eval $(call chs_sw_gen_hdr_rule,clint,$(CLINTROOT)/src/clint.hjson | $(CLINTROOT)/.generated))
+$(eval $(call chs_sw_gen_hdr_rule,serial_link,$(CHS_ROOT)/hw/serial_link.hjson | $(CHS_SLINK_DIR)/.generated))
+$(eval $(call chs_sw_gen_hdr_rule,axi_vga,$(AXI_VGA_ROOT)/data/axi_vga.hjson | $(AXI_VGA_ROOT)/.generated))
 $(eval $(call chs_sw_gen_hdr_rule,idma,$(IDMA_ROOT)/target/rtl/idma_reg64_2d.hjson))
 $(eval $(call chs_sw_gen_hdr_rule,axi_llc,$(CHS_LLC_DIR)/data/axi_llc_regs.hjson))
 $(eval $(call chs_sw_gen_hdr_rule,cheshire,$(CHS_ROOT)/hw/regs/cheshire_regs.hjson))
-$(eval $(call chs_sw_gen_hdr_rule,axi_rt,$(AXIRTROOT)/src/regs/axi_rt.hjson $(AXIRTROOT)/.generated))
+$(eval $(call chs_sw_gen_hdr_rule,axi_rt,$(AXIRTROOT)/src/regs/axi_rt.hjson | $(AXIRTROOT)/.generated))
 
 # Generate headers for OT peripherals in the bendered repo itself
 CHS_SW_GEN_HDRS += $(OTPROOT)/.generated