diff --git a/src/libopensc/pkcs15-tccardos.c b/src/libopensc/pkcs15-tccardos.c
index 3c245a67..f78c9d7c 100644
--- a/src/libopensc/pkcs15-tccardos.c
+++ b/src/libopensc/pkcs15-tccardos.c
@@ -50,8 +50,10 @@ static int read_file(struct sc_card *card, const char *file, u8 *buf,
 
 	sc_format_path(file, &path);
 	r = sc_select_file(card, &path, &fid);
-	if (r != SC_SUCCESS || !fid)
+	if (r != SC_SUCCESS)
 		return r;
+	if (!fid)
+		return SC_ERROR_INTERNAL;
 	if (fid->size < *len)
 		*len = fid->size;
 	r = sc_read_binary(card, 0, buf, *len, 0);