diff --git a/lib/main.js b/lib/main.js
index 59306538..83c56542 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -375,7 +375,10 @@ define([
                 }
             }
         };
-        self.getFontHeight = function getFontHeight(fontStyle) {
+        self.getFontHeight = function (fontStyle) {
+            return parseFloat(fontStyle, 10);
+        };
+        self.getFontHeightLong = function (fontStyle) {
             var pixels,
                 start,
                 end,