diff --git a/sys/conf/Makefile.arm b/sys/conf/Makefile.arm
--- a/sys/conf/Makefile.arm
+++ b/sys/conf/Makefile.arm
@@ -64,9 +64,6 @@
 	    --strip-symbol='$$[adt]*' \
 	    ${.TARGET}
 
-# hack because genassym.c includes sys/bus.h which includes these.
-genassym.o: bus_if.h device_if.h
-
 %BEFORE_DEPEND
 
 %OBJS
diff --git a/sys/conf/Makefile.riscv b/sys/conf/Makefile.riscv
--- a/sys/conf/Makefile.riscv
+++ b/sys/conf/Makefile.riscv
@@ -39,9 +39,6 @@
 CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 .endif
 
-# hack because genassym.c includes sys/bus.h which includes these.
-genassym.o: bus_if.h device_if.h
-
 %BEFORE_DEPEND
 
 %OBJS