diff --git a/tools/test/xregs_sig/Makefile b/tools/test/xregs_sig/Makefile
--- a/tools/test/xregs_sig/Makefile
+++ b/tools/test/xregs_sig/Makefile
@@ -2,16 +2,10 @@
 .include <src.opts.mk>
 
 PROG=		xregs_sig
-SRCS=		xregs_sig.c
+SRCS=		xregs_sig.c c2x2c_${MACHINE_CPUARCH}.S
+
 MAN=
 
 LIBADD=		pthread
 
-.if ${MACHINE_CPUARCH} == "amd64"
-SRCS+=		c2x2c_amd64.S
-.endif
-.if ${MACHINE_CPUARCH} == "aarch64"
-SRCS+=		c2x2c_aarch64.S
-.endif
-
 .include <bsd.prog.mk>