diff --git a/notmuch-reply.c b/notmuch-reply.c
index 13571429..6df54fc9 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -80,7 +80,8 @@ format_part_reply (mime_node_t *node)
 	    show_text_part_content (node->part, stream_stdout, NOTMUCH_SHOW_TEXT_PART_REPLY);
 	    g_object_unref(stream_stdout);
 	} else if (disposition &&
-		   strcmp (disposition->disposition, GMIME_DISPOSITION_ATTACHMENT) == 0) {
+		   strcasecmp (g_mime_content_disposition_get_disposition (disposition),
+			       GMIME_DISPOSITION_ATTACHMENT) == 0) {
 	    const char *filename = g_mime_part_get_filename (GMIME_PART (node->part));
 	    printf ("Attachment: %s (%s)\n", filename,
 		    g_mime_content_type_to_string (content_type));
diff --git a/notmuch-show.c b/notmuch-show.c
index 5a83c605..87e52bbc 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -456,7 +456,8 @@ format_part_text (const void *ctx, sprinter_t *sp, mime_node_t *node,
 	    g_mime_part_get_filename (GMIME_PART (node->part)) : NULL;
 
 	if (disposition &&
-	    strcmp (disposition->disposition, GMIME_DISPOSITION_ATTACHMENT) == 0)
+	    strcasecmp (g_mime_content_disposition_get_disposition (disposition),
+			GMIME_DISPOSITION_ATTACHMENT) == 0)
 	    part_type = "attachment";
 	else
 	    part_type = "part";