diff --git a/programs/fuzz/fuzz_x509crt.c b/programs/fuzz/fuzz_x509crt.c
index 3eee072..74d3b07 100644
--- a/programs/fuzz/fuzz_x509crt.c
+++ b/programs/fuzz/fuzz_x509crt.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include "mbedtls/x509_crt.h"
+#include "common.h"
 
 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
 {