diff --git a/notmuch-client.h b/notmuch-client.h
index c602e2e0..c521efa0 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -162,7 +162,7 @@ char *
 query_string_from_args (void *ctx, int argc, char *argv[]);
 
 notmuch_status_t
-show_message_body (const char *filename,
+show_message_body (notmuch_message_t *message,
 		   const notmuch_show_format_t *format,
 		   notmuch_show_params_t *params);
 
diff --git a/notmuch-reply.c b/notmuch-reply.c
index 7ac879f9..f8d5f647 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -546,8 +546,7 @@ notmuch_reply_format_default(void *ctx,
 		notmuch_message_get_header (message, "date"),
 		notmuch_message_get_header (message, "from"));
 
-	show_message_body (notmuch_message_get_filename (message),
-			   format, params);
+	show_message_body (message, format, params);
 
 	notmuch_message_destroy (message);
     }
diff --git a/notmuch-show.c b/notmuch-show.c
index 19fb49f2..0200b9c4 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -758,8 +758,7 @@ show_message (void *ctx,
     }
 
     if (format->part_content)
-	show_message_body (notmuch_message_get_filename (message),
-			   format, params);
+	show_message_body (message, format, params);
 
     if (params->part <= 0) {
 	fputs (format->body_end, stdout);
diff --git a/show-message.c b/show-message.c
index d83f04ec..09fa607f 100644
--- a/show-message.c
+++ b/show-message.c
@@ -175,7 +175,7 @@ show_message_part (GMimeObject *part,
 }
 
 notmuch_status_t
-show_message_body (const char *filename,
+show_message_body (notmuch_message_t *message,
 		   const notmuch_show_format_t *format,
 		   notmuch_show_params_t *params)
 {
@@ -183,6 +183,7 @@ show_message_body (const char *filename,
     GMimeParser *parser = NULL;
     GMimeMessage *mime_message = NULL;
     notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
+    const char *filename = notmuch_message_get_filename (message);
     FILE *file = NULL;
     show_message_state_t state;