diff --git a/src/rdrand.c b/src/rdrand.c
index 1dc3f8e1d..77ce4bd12 100644
--- a/src/rdrand.c
+++ b/src/rdrand.c
@@ -13,6 +13,9 @@
 #include <stdlib.h>
 #include <gmssl/error.h>
 #include <immintrin.h>
+#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
+#include <x86intrin.h>
+#endif
 
 int rdrand_bytes(uint8_t *buf, size_t buflen)
 {