diff --git a/crypto/memzero.c b/crypto/memzero.c
index 32aa140f4..1c5ea77a6 100644
--- a/crypto/memzero.c
+++ b/crypto/memzero.c
@@ -4,7 +4,7 @@
 #include <string.h>
 
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #endif
 
 #ifdef __unix__