diff --git a/src/common/processing_windows.c b/src/common/processing_windows.c
index c8f28d87e..f414ac7a1 100644
--- a/src/common/processing_windows.c
+++ b/src/common/processing_windows.c
@@ -2,7 +2,7 @@
 #include "common/processing.h"
 #include "common/io/io.h"
 
-#include <Windows.h>
+#include <windows.h>
 #include <ntstatus.h>
 #include <winternl.h>
 
diff --git a/src/detection/displayserver/displayserver_windows.c b/src/detection/displayserver/displayserver_windows.c
index 88d1a2e00..304beaf44 100644
--- a/src/detection/displayserver/displayserver_windows.c
+++ b/src/detection/displayserver/displayserver_windows.c
@@ -3,7 +3,7 @@
 #include "util/edidHelper.h"
 
 #include <dwmapi.h>
-#include <WinUser.h>
+#include <winuser.h>
 #include <wchar.h>
 
 typedef struct FFMonitorInfo
diff --git a/src/detection/opengl/opengl_windows.c b/src/detection/opengl/opengl_windows.c
index fe82ec14e..8faa27dc4 100644
--- a/src/detection/opengl/opengl_windows.c
+++ b/src/detection/opengl/opengl_windows.c
@@ -2,7 +2,7 @@
 #include "common/library.h"
 #include "common/printing.h"
 
-#include <Windows.h>
+#include <windows.h>
 #include <GL/gl.h>
 
 typedef struct WGLData
diff --git a/src/util/platform/FFPlatform_windows.c b/src/util/platform/FFPlatform_windows.c
index ee45f68bf..753249df8 100644
--- a/src/util/platform/FFPlatform_windows.c
+++ b/src/util/platform/FFPlatform_windows.c
@@ -6,7 +6,7 @@
 #include "util/windows/registry.h"
 #include "util/windows/nt.h"
 
-#include <Windows.h>
+#include <windows.h>
 #include <shlobj.h>
 
 #define SECURITY_WIN32 1 // For secext.h
diff --git a/src/util/windows/wmi.hpp b/src/util/windows/wmi.hpp
index f4340ae7b..c506a8868 100644
--- a/src/util/windows/wmi.hpp
+++ b/src/util/windows/wmi.hpp
@@ -7,7 +7,7 @@ extern "C" {
 }
 
 #include <initguid.h>
-#include <Wbemidl.h>
+#include <wbemidl.h>
 #include <cassert>
 
 #include "variant.hpp"