diff --git a/wiring.scad b/wiring.scad
index 9298924..bd168b0 100644
--- a/wiring.scad
+++ b/wiring.scad
@@ -8,6 +8,9 @@
 // FileSummary: Routed bundles of wires.
 //////////////////////////////////////////////////////////////////////
 
+_BOSL2_WIRING = is_undef(_BOSL2_STD) && (is_undef(BOSL2_NO_STD_WARNING) || !BOSL2_NO_STD_WARNING) ?
+       echo("Warning: wiring.scad included without std.scad; dependencies may be missing\nSet BOSL2_NO_STD_WARNING = true to mute this warning.") true : true;
+
 include <rounding.scad>