diff --git a/linux/debian/essentials/postinst b/linux/debian/essentials/postinst
index ae2954f86142f455a9950b506313b6392e6b7d61..29e13ad5c33f5706674a2a1b4bcfafbd972d7974 100755
--- a/linux/debian/essentials/postinst
+++ b/linux/debian/essentials/postinst
@@ -25,7 +25,7 @@ fi
 
 cat $DAP_CFG_TPL > $DAP_CFG || true
 
-sed -i "s/{PREFIX}/$RET/g" $DAP_CFG  || true
+sed -i "s/{PREFIX}/\/opt\/$DAP_APP_NAME/g" $DAP_CFG  || true
 
 db_get cellframe-node/debug_mode || true
 sed -i "s/{DEBUG_MODE}/$RET/g" $DAP_CFG  || true