diff --git a/Backends/RmlUi_Renderer_GL3.cpp b/Backends/RmlUi_Renderer_GL3.cpp
index 183682353..899b645ac 100644
--- a/Backends/RmlUi_Renderer_GL3.cpp
+++ b/Backends/RmlUi_Renderer_GL3.cpp
@@ -35,6 +35,7 @@
 #include <RmlUi/Core/MeshUtilities.h>
 #include <RmlUi/Core/Platform.h>
 #include <RmlUi/Core/SystemInterface.h>
+#include <algorithm>
 #include <string.h>
 
 #if defined(RMLUI_PLATFORM_WIN32) && !defined(__MINGW32__)