diff --git a/lib/less/functions.js b/lib/less/functions.js
index 1f63993b..3e38d5eb 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -5,7 +5,7 @@ tree.functions = {
         return this.rgba(r, g, b, 1.0);
     },
     rgba: function (r, g, b, a) {
-        var rgb = [r, g, b].map(function (c) { return scaled(c, 256); });
+        var rgb = [r, g, b].map(function (c) { return scaled(c, 255); });
         a = number(a);
         return new(tree.Color)(rgb, a);
     },
diff --git a/test/css/colors.css b/test/css/colors.css
index 16956772..41d1c9c1 100644
--- a/test/css/colors.css
+++ b/test/css/colors.css
@@ -78,3 +78,7 @@
 #alpha #hsl {
   opacity: 1;
 }
+#percentage {
+  color: 255;
+  border-color: rgba(255, 0, 0, 0.5);
+}
diff --git a/test/less/colors.less b/test/less/colors.less
index 656ca636..2c6155ab 100644
--- a/test/less/colors.less
+++ b/test/less/colors.less
@@ -90,3 +90,8 @@
         opacity: alpha(hsl(120, 100%, 50%));
     }
 }
+
+#percentage {
+  color: red(rgb(100%, 0, 0));
+  border-color: rgba(100%, 0, 0, 50%);
+}