diff --git a/rust/wrapper.h b/rust/wrapper.h
index ff63244..316cff1 100644
--- a/rust/wrapper.h
+++ b/rust/wrapper.h
@@ -18,6 +18,7 @@
 #include "../include/openssl/conf.h"
 #include "../include/openssl/cpu.h"
 #include "../include/openssl/crypto.h"
+#include "../include/openssl/ctrdrbg.h"
 #include "../include/openssl/curve25519.h"
 #include "../include/openssl/des.h"
 #include "../include/openssl/dh.h"