diff --git a/src/ssl.c b/src/ssl.c
index cf30c5baa..2ba19ff7e 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -163,6 +163,7 @@
 #endif /* !WOLFCRYPT_ONLY || OPENSSL_EXTRA */
 
 #ifdef _WIN32
+#include <windows.h>
 #include <Wincrypt.h>
 #pragma comment(lib, "crypt32")
 #endif