diff --git a/linear_bearings.scad b/linear_bearings.scad
index 8c1dd86..4727e40 100644
--- a/linear_bearings.scad
+++ b/linear_bearings.scad
@@ -8,6 +8,10 @@
 // FileSummary: Mounts for LMxUU style linear bearings.
 //////////////////////////////////////////////////////////////////////
 
+_BOSL2_LINEAR_BEARINGS = is_undef(_BOSL2_STD) && (is_undef(BOSL2_NO_STD_WARNING) || !BOSL2_NO_STD_WARNING) ?
+       echo("Warning: linear_bearings.scad included without std.scad; dependencies may be missing\nSet BOSL2_NO_STD_WARNING = true to mute this warning.") true : true;
+
+
 include <screws.scad>