diff --git a/chrome/content/zotero/xpcom/file.js b/chrome/content/zotero/xpcom/file.js
index 9ad7eec4e6..a76278a3ef 100644
--- a/chrome/content/zotero/xpcom/file.js
+++ b/chrome/content/zotero/xpcom/file.js
@@ -83,10 +83,10 @@ Zotero.File = new function(){
 	
 	
 	/*
-	 * Get the first 128 bytes of the file as a string (multibyte-safe)
+	 * Get the first 200 bytes of the file as a string (multibyte-safe)
 	 */
 	function getSample(file) {
-		return this.getContents(file, null, 128);
+		return this.getContents(file, null, 200);
 	}
 	
 	
diff --git a/chrome/content/zotero/xpcom/mime.js b/chrome/content/zotero/xpcom/mime.js
index ca1d50dcf8..0557fd0fa2 100644
--- a/chrome/content/zotero/xpcom/mime.js
+++ b/chrome/content/zotero/xpcom/mime.js
@@ -233,7 +233,7 @@ Zotero.MIME = new function(){
 				}
 			}
 			// Otherwise allow match anywhere in sample
-			// (128 bytes from getSample() by default)
+			// (200 bytes from getSample() by default)
 			else if (str.indexOf(_snifferEntries[i][0]) != -1) {
 				match = true;
 			}