diff --git a/src/gui_at_sb.h b/src/gui_at_sb.h
index 0d3d196..90940f5 100644
--- a/src/gui_at_sb.h
+++ b/src/gui_at_sb.h
@@ -110,7 +110,7 @@
     float	  max;		/* Maximum value for top */
     Dimension	  length;	/* either height or width */
     Dimension	  thickness;	/* either width or height */
-    Dimension	  min_thumb;	/* minium size for the thumb. */
+    Dimension	  min_thumb;	/* minimum size for the thumb. */
 
      /* private */
     XtIntervalId  timer_id;	/* autorepeat timer; remove on destruction */