diff --git a/xbps-src b/xbps-src
index c273448a453..102162f7fe1 100755
--- a/xbps-src
+++ b/xbps-src
@@ -577,7 +577,7 @@ if [ -z "$IN_CHROOT" -a -n "$XBPS_TEMP_MASTERDIR" ]; then
         echo "ERROR: -t requires XBPS_CHROOT_CMD=uchroot, exiting..."
         exit 1
     fi
-    export XBPS_CHROOT_CMD_ARGS="-O"
+    export XBPS_CHROOT_CMD_ARGS+=" -O"
 fi
 #
 # Sanitize PATH.