diff --git a/test/benchmark.c b/test/benchmark.c
index b3caa9a..648727d 100644
--- a/test/benchmark.c
+++ b/test/benchmark.c
@@ -13,7 +13,7 @@
 #include <stdio.h>
 #include <time.h>
 
-#ifdef _WIN32
+#if defined(_WIN32) || defined(_WIN64)
 #  include <windows.h>
 #  include <wincrypt.h>
 #else
@@ -66,7 +66,7 @@ bytes_to_mb (size_t bytes)
 static bool
 get_random_data (struct buffers *b, char **errmsg)
 {
-#ifdef _WIN32
+#if defined(_WIN32) || defined(_WIN64)
 	HCRYPTPROV hProvider = 0;
 
 	if (!CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
@@ -130,7 +130,7 @@ timediff_sec (base64_timespec *start, base64_timespec *end)
 
 	return (float)((diff * tb.numer) / tb.denom) / 1e9f;
 }
-#elif defined(_WIN32) && !(defined(__MINGW32__) || defined(__MINGW64__))
+#elif (defined(_WIN32) || defined(_WIN64)) && !(defined(__MINGW32__) || defined(__MINGW64__))
 typedef struct timespec base64_timespec;
 static void
 base64_gettime (base64_timespec *o_time)