diff --git a/aegisub/src/video_out_gl.cpp b/aegisub/src/video_out_gl.cpp
index daea2729d..9c922093f 100644
--- a/aegisub/src/video_out_gl.cpp
+++ b/aegisub/src/video_out_gl.cpp
@@ -38,8 +38,12 @@
 
 #ifndef AGI_PRE
 #include <wx/log.h>
+#include <algorithm>
 #endif
 
+using std::min;
+using std::max;
+
 // These must be included before local headers.
 #ifdef __APPLE__
 #include <OpenGL/GL.h>