diff --git a/libsoup/soup-content-sniffer.c b/libsoup/soup-content-sniffer.c
index 967ec6141a3923e8cd531ddac568babc06362a56..bab85eaa2db7101143a1dfe4cc1c4f9ba4cba096 100644
--- a/libsoup/soup-content-sniffer.c
+++ b/libsoup/soup-content-sniffer.c
@@ -638,7 +638,7 @@ sniff_feed_or_html (SoupContentSniffer *sniffer, SoupBuffer *buffer)
 		goto text_html;
 
 	/* Skip a leading UTF-8 BOM */
-	if (resource[0] == 0xEF && resource[1] == 0xBB && resource[2] == 0xBF)
+	if (resource[0] == (const char)0xEF && resource[1] == (const char)0xBB && resource[2] == (const char)0xBF)
 		pos = 3;
 
  look_for_tag: