diff --git a/chrome/content/zotero/xpcom/integration_worker.js b/chrome/content/zotero/xpcom/integration_worker.js
index 51f10f4d7..69253c5ef 100644
--- a/chrome/content/zotero/xpcom/integration_worker.js
+++ b/chrome/content/zotero/xpcom/integration_worker.js
@@ -49,7 +49,7 @@ onmessage = function(event) {
 		var fd = open(path, 0);
 		
 		// read from fifo and close it
-		read(fd, buf, BUFFER_SIZE);
+		read(fd, buf, BUFFER_SIZE-1);
 		close(fd);
 		
 		// extract message