diff --git a/release/picobsd/floppy.tree/etc/profile b/release/picobsd/floppy.tree/etc/profile
index babb9333f494..deb3213e76f2 100644
--- a/release/picobsd/floppy.tree/etc/profile
+++ b/release/picobsd/floppy.tree/etc/profile
@@ -1,3 +1,4 @@
 # System-wide .profile file for sh(1).
 BLOCKSIZE=K; export BLOCKSIZE
 PATH=/stand:.; export PATH
+set -E