diff --git a/HISTORY.md b/HISTORY.md
index d6ade7c..28ed2ee 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -4,6 +4,8 @@ Pure Change History
 NEXT
 ----
 
+* Fix class `.pure-u-1-6` to change width from 16.656% to 16.666%
+
 * Apply `.pure-form-group input` styling to all text-ish `input` elements.
 
 * Added `display: block` to `textarea` in `.pure-form-stacked` to fix an
diff --git a/src/grids/css/grids-units.css b/src/grids/css/grids-units.css
index d28cb4e..02a2d32 100644
--- a/src/grids/css/grids-units.css
+++ b/src/grids/css/grids-units.css
@@ -76,7 +76,7 @@
 }
 
 .pure-u-1-6 {
-    width: 16.656%;
+    width: 16.666%;
 }
 
 .pure-u-5-6 {