diff --git a/libvmaf/test/test_framesync.c b/libvmaf/test/test_framesync.c
index f5e9997cc..c6104c0c9 100644
--- a/libvmaf/test/test_framesync.c
+++ b/libvmaf/test/test_framesync.c
@@ -19,7 +19,7 @@
 #include <stdint.h>
 #include <string.h>
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #else
 #include <unistd.h>
 #endif