diff --git a/sys/boot/efi/libefi/Makefile b/sys/boot/efi/libefi/Makefile
index 7f22dc4a8f40..33a8f3e7e04e 100644
--- a/sys/boot/efi/libefi/Makefile
+++ b/sys/boot/efi/libefi/Makefile
@@ -26,6 +26,7 @@ SRCS+=	time_event.c
 # of a short. There's no good cast to use here so just ignore the
 # warnings for now.
 CWARNFLAGS.efinet.c+=	-Wno-format
+CWARNFLAGS.efipart.c+=	-Wno-format
 CWARNFLAGS.env.c+=	-Wno-format
 
 .if ${MACHINE_CPUARCH} == "aarch64"