diff --git a/lib/libelf/Makefile b/lib/libelf/Makefile
index 950233e28..b6bb20c6a 100644
--- a/lib/libelf/Makefile
+++ b/lib/libelf/Makefile
@@ -167,4 +167,4 @@ INCSDIR= /usr/include
 # Keep the .SUFFIXES line after the include of bsd.lib.mk
 .SUFFIXES:	.m4 .c
 .m4.c:
-	m4 -D SRCDIR=${.CURDIR} ${.IMPSRC} > ${.TARGET}
+	${TOOL_M4} -D SRCDIR=${.CURDIR} ${.IMPSRC} > ${.TARGET}