--- fivestar.module
+++ fivestar.module
@@ -1689,7 +1689,10 @@
     return ceil(($value / 100) * $stars);
   }
   else {
-    return round(($value / 100) * $stars, 1);
+    if ($field->options['set_precision']) {
+      return round(($value / 100) * $stars, $field->options['precision']);
+    }
+    return ($value / 100) * $stars;
   }
 }