diff --git a/chrome/content/zotero/xpcom/ipc.js b/chrome/content/zotero/xpcom/ipc.js
index 9c10ae37e1..3f91aa9ac9 100755
--- a/chrome/content/zotero/xpcom/ipc.js
+++ b/chrome/content/zotero/xpcom/ipc.js
@@ -126,11 +126,11 @@ Zotero.IPC = new function() {
 			}
 		}
 		
-		// On OS X, O_NONBLOCK = 0x0004
+		// On OS X and FreeBSD, O_NONBLOCK = 0x0004
 		// On Linux, O_NONBLOCK = 00004000
 		// On both, O_WRONLY = 0x0001
 		var mode = 0x0001;
-		if(!block) mode = mode | (Zotero.isMac ? 0x0004 : 00004000);
+		if(!block) mode = mode | (Zotero.isLinux ? 00004000 : 0x0004);
 		
 		// Also append to plain files to get things working with Fx 3.6 polling
 		// On OS X, O_APPEND = 0x0008