diff --git a/stand/efi/boot1/Makefile b/stand/efi/boot1/Makefile
index fb1c7d74eec..607c30f10cf 100644
--- a/stand/efi/boot1/Makefile
+++ b/stand/efi/boot1/Makefile
@@ -12,11 +12,12 @@ CFLAGS+=	-DEFI_BOOT1
 # seems to matter on arm64 where wchar_t defaults to an int instead
 # of a short. There's no good cast to use here so just ignore the
 # warnings for now.
-CWARNFLAGS.proto.c+=	-Wno-format
-CWARNFLAGS.boot1.c+=	-Wno-format
+CWARNFLAGS.proto.c      += -Wno-format
+CWARNFLAGS.boot1.c      += -Wno-format
+CWARNFLAGS.ufs_module.c += -Wno-format
+CWARNFLAGS.zfs_module.c += -Wno-format
 
 # Disable bogus alignment issues
-CWARNFLAGS.ufs_module.c += -Wno-format
 CWARNFLAGS.ufs_module.c += -Wno-cast-align
 
 # Disable warnings that are currently incompatible with the zfs boot code