diff --git a/sys/conf/files b/sys/conf/files
index 168abd783e37..9d11055036dd 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -623,7 +623,8 @@ fs/umapfs/umap_vnops.c	optional umapfs
 fs/unionfs/union_subr.c	optional unionfs
 fs/unionfs/union_vfsops.c	optional unionfs
 fs/unionfs/union_vnops.c	optional unionfs
-gnu/ext2fs/ext2_alloc.c		optional ext2fs
+gnu/ext2fs/ext2_alloc.c		optional ext2fs \
+	warning "kernel contains GPL contaminated ext2fs file system"
 gnu/ext2fs/ext2_balloc.c	optional ext2fs
 gnu/ext2fs/ext2_inode.c		optional ext2fs
 gnu/ext2fs/ext2_inode_cnv.c	optional ext2fs
diff --git a/sys/conf/files.i386 b/sys/conf/files.i386
index a713525e894c..d5d307a2d422 100644
--- a/sys/conf/files.i386
+++ b/sys/conf/files.i386
@@ -129,7 +129,8 @@ fs/smbfs/smbfs_smb.c		optional	smbfs
 fs/smbfs/smbfs_subr.c		optional	smbfs
 fs/smbfs/smbfs_vfsops.c		optional	smbfs
 fs/smbfs/smbfs_vnops.c		optional	smbfs
-gnu/i386/fpemul/div_small.s	optional	gpl_math_emulate
+gnu/i386/fpemul/div_small.s	optional	gpl_math_emulate \
+	warning "kernel contains GPL contaminated math emulator"
 gnu/i386/fpemul/errors.c	optional	gpl_math_emulate
 gnu/i386/fpemul/fpu_arith.c	optional	gpl_math_emulate
 gnu/i386/fpemul/fpu_aux.c	optional	gpl_math_emulate