diff --git a/srcpkgs/cdm/patches/fix-bashisms.patch b/srcpkgs/cdm/patches/fix-bashisms.patch
new file mode 100644
index 00000000000..a81f665c948
--- /dev/null
+++ b/srcpkgs/cdm/patches/fix-bashisms.patch
@@ -0,0 +1,18 @@
+Source: maxice8
+Upstream: to be upstreamed
+Reason: fixes running it with POSIX shells
+
+--- src/profile.sh
++++ src/profile.sh
+@@ -1,8 +1,8 @@
+ # To avoid potential situation where cdm(1) crashes on every TTY, here we
+ # default to execute cdm(1) on tty1 only, and leave other TTYs untouched.
+-if [[ "$(tty)" == '/dev/tty1' ]]; then
+-    [[ -n "$CDM_SPAWN" ]] && return
++if [ "$(tty)" = '/dev/tty1' ]; then
++    [ -n "$CDM_SPAWN" ] && return
+     # Avoid executing cdm(1) when X11 has already been started.
+-    [[ -z "$DISPLAY$SSH_TTY$(pgrep xinit)" ]] && exec cdm
++    [ -z "$DISPLAY$SSH_TTY$(pgrep xinit)" ] && exec cdm
+ fi
+ 
diff --git a/srcpkgs/cdm/template b/srcpkgs/cdm/template
index 6caa024c47b..5d409f36376 100644
--- a/srcpkgs/cdm/template
+++ b/srcpkgs/cdm/template
@@ -1,7 +1,7 @@
 # Template file for 'cdm'
 pkgname=cdm
 version=0.7
-revision=1
+revision=2
 short_desc="Console Display Manager"
 maintainer="Andrea Brancaleoni <abc@pompel.me>"
 depends="dialog xinit kbd xdpyinfo"