diff --git a/.gitignore b/.gitignore
index 7afe557..e4bc455 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 node_modules
 lib
 tmp
+npm-debug.log
diff --git a/package.json b/package.json
index f6bab18..0fe0009 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,8 @@
   "scripts": {
     "benchmark": "grunt benchmark",
     "test": "grunt test",
-    "prepublish": "grunt build"
+    "prepublish": "grunt build",
+    "preinstall": "grunt build"
   },
   "devDependencies": {
     "coffee-script": "~1.6.3",
diff --git a/src/index.litcoffee b/src/index.litcoffee
index 5073fbc..4a772b3 100644
--- a/src/index.litcoffee
+++ b/src/index.litcoffee
@@ -112,7 +112,7 @@ Add a single row.
 
         @_startRow()
         for key, col in @cellMap
-          @_addCell(row[key] || "", col + 1)
+          @_addCell((if row[key] == 0 then 0 else row[key] || ""), col + 1)
         @_endRow()
 
 ##### addRows(rows: Array)