diff --git a/src/rdrand.c b/src/rdrand.c
index ee8d3259..1dc3f8e1 100644
--- a/src/rdrand.c
+++ b/src/rdrand.c
@@ -16,7 +16,7 @@
 
 int rdrand_bytes(uint8_t *buf, size_t buflen)
 {
-	uint64_t val;
+	unsigned long long val;
 	uint8_t *p = (uint8_t *)&val;
 
 	while (buflen) {
@@ -34,7 +34,7 @@ int rdrand_bytes(uint8_t *buf, size_t buflen)
 
 int rdseed_bytes(uint8_t *buf, size_t buflen)
 {
-	uint64_t val;
+	unsigned long long val;
 	uint8_t *p = (uint8_t *)&val;
 
 	while (buflen) {