diff --git a/sys/boot/efi/boot1/Makefile b/sys/boot/efi/boot1/Makefile
index 0675ccaa7082..0c2394524b09 100644
--- a/sys/boot/efi/boot1/Makefile
+++ b/sys/boot/efi/boot1/Makefile
@@ -73,8 +73,8 @@ LDADD+=		-lstand
 
 DPADD+=		${LDSCRIPT}
 
+NM?=		nm
 OBJCOPY?=	objcopy
-OBJDUMP?=	objdump
 
 .if ${MACHINE_CPUARCH} == "amd64"
 EFI_TARGET=	efi-app-x86_64
@@ -85,8 +85,8 @@ EFI_TARGET=	binary
 .endif
 
 boot1.efi: ${PROG}
-	if [ `${OBJDUMP} -t ${.ALLSRC} | fgrep '*UND*' | wc -l` != 0 ]; then \
-		${OBJDUMP} -t ${.ALLSRC} | fgrep '*UND*'; \
+	if ${NM} ${.ALLSRC} | grep ' U '; then \
+		echo "Undefined symbols in ${.ALLSRC}"; \
 		exit 1; \
 	fi
 	${OBJCOPY} -j .peheader -j .text -j .sdata -j .data \
diff --git a/sys/boot/efi/loader/Makefile b/sys/boot/efi/loader/Makefile
index 9246bf236abc..f4f6cbf6a44d 100644
--- a/sys/boot/efi/loader/Makefile
+++ b/sys/boot/efi/loader/Makefile
@@ -98,8 +98,8 @@ NEWVERSWHAT=	"EFI loader" ${MACHINE}
 vers.c:	${.CURDIR}/../../common/newvers.sh ${.CURDIR}/../../efi/loader/version
 	sh ${.CURDIR}/../../common/newvers.sh ${.CURDIR}/version ${NEWVERSWHAT}
 
+NM?=		nm
 OBJCOPY?=	objcopy
-OBJDUMP?=	objdump
 
 .if ${MACHINE_CPUARCH} == "amd64"
 EFI_TARGET=	efi-app-x86_64
@@ -110,8 +110,8 @@ EFI_TARGET=	binary
 .endif
 
 loader.efi: ${PROG}
-	if [ `${OBJDUMP} -t ${.ALLSRC} | fgrep '*UND*' | wc -l` != 0 ]; then \
-		${OBJDUMP} -t ${.ALLSRC} | fgrep '*UND*'; \
+	if ${NM} ${.ALLSRC} | grep ' U '; then \
+		echo "Undefined symbols in ${.ALLSRC}"; \
 		exit 1; \
 	fi
 	${OBJCOPY} -j .peheader -j .text -j .sdata -j .data \