diff --git a/dotfiles/zshrc.d/assemble.zsh b/dotfiles/zshrc.d/assemble.zsh
index 061dea9..8814484 100644
--- a/dotfiles/zshrc.d/assemble.zsh
+++ b/dotfiles/zshrc.d/assemble.zsh
@@ -1,4 +1,4 @@
-if [ -f "`command which nasm`" -a -f "`command which objdump`" ] ; then
+if [ -f "`command which nasm 2>/dev/null`" -a -f "`command which objdump 2>/dev/null`" ] ; then
   assemble_shellcode() {
     if [ -z "$1" ] ; then echo "Usage: $0 <assembly file>" >&2 ; return 1 ; fi
     local NASM=`command which nasm`