diff --git a/programs/fuzz/fuzz_pkcs7.c b/programs/fuzz/fuzz_pkcs7.c
index 38b4dc1..9ec9351 100644
--- a/programs/fuzz/fuzz_pkcs7.c
+++ b/programs/fuzz/fuzz_pkcs7.c
@@ -1,3 +1,5 @@
+#define MBEDTLS_DECLARE_PRIVATE_IDENTIFIERS
+
 #include <stdint.h>
 #include "mbedtls/pkcs7.h"
 #include "common.h"