diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -98,11 +98,9 @@
 # not declared for no generation of default code (NOASM).  Add each
 # syscall that satisfies these conditions to the ASM list.
 .for _asm in ${MIASM}
-.if (${MDASM:R:M${_asm:R}} == "")
-.if (${NOASM:R:M${_asm:R}} == "")
+.if !${MDASM:R:M${_asm:R}} && !${NOASM:R:M${_asm:R}}
 ASM+=$(_asm)
 .endif
-.endif
 .endfor
 
 SASM=	${ASM:S/.o/.S/}