diff --git a/build.php b/build.php
index 0069fed..d8bbded 100755
--- a/build.php
+++ b/build.php
@@ -26,7 +26,8 @@
 EOT;
 foreach (glob('file/js/*.coffee') as $coffeeFile) {
 	echo $coffeeFile."\n";
-	passthru('coffee -cb '.escapeshellarg($coffeeFile));
+	passthru('coffee -cb '.escapeshellarg($coffeeFile), $code);
+	if ($code != 0) exit($code);
 }
 echo <<<EOT
 
@@ -36,7 +37,8 @@
 EOT;
 foreach (glob('file/style/*.scss') as $sassFile) {
 	echo $sassFile."\n";
-	passthru('scss '.escapeshellarg($sassFile).' '.escapeshellarg(substr($sassFile, 0, -4).'css'));
+	passthru('scss '.escapeshellarg($sassFile).' '.escapeshellarg(substr($sassFile, 0, -4).'css'), $code);
+	if ($code != 0) exit($code);
 }
 echo <<<EOT
 
@@ -45,7 +47,8 @@
 
 EOT;
 	chdir('file');
-	passthru('tar cvf ../file.tar * --exclude=*.coffee');
+	passthru('tar cvf ../file.tar * --exclude=*.coffee', $code);
+	if ($code != 0) exit($code);
 echo <<<EOT
 
 Building template.tar
@@ -53,7 +56,8 @@
 
 EOT;
 	chdir('../template');
-	passthru('tar cvf ../template.tar *');
+	passthru('tar cvf ../template.tar *', $code);
+	if ($code != 0) exit($code);
 echo <<<EOT
 
 Building timwolla.wcf.chat.tar
@@ -61,7 +65,8 @@
 
 EOT;
 	chdir('..');
-	passthru('tar cvf timwolla.wcf.chat.tar * --exclude=file --exclude=template --exclude=build.php');
+	passthru('tar cvf timwolla.wcf.chat.tar * --exclude=file --exclude=template --exclude=build.php', $code);
+	if ($code != 0) exit($code);
 
 if (file_exists('file.tar')) unlink('file.tar');
 if (file_exists('template.tar')) unlink('template.tar');