diff --git a/meta-oe/recipes-core/dropbear/dropbear_2011.54.bbappend b/meta-oe/recipes-core/dropbear/dropbear_2011.54.bbappend
index a642235..874a7d4 100644
--- a/meta-oe/recipes-core/dropbear/dropbear_2011.54.bbappend
+++ b/meta-oe/recipes-core/dropbear/dropbear_2011.54.bbappend
@@ -1,6 +1,6 @@
 inherit systemd
 
-PRINC = "1"
+PRINC := "${@int(PRINC) + 1}"
 
 # look for files in the layer first
 FILESEXTRAPATHS := "${THISDIR}/${PN}"