diff --git a/panda/src/windisplay/winDetectDx.h b/panda/src/windisplay/winDetectDx.h
index 37ca807f3d..58827aa570 100644
--- a/panda/src/windisplay/winDetectDx.h
+++ b/panda/src/windisplay/winDetectDx.h
@@ -12,6 +12,8 @@
 //
 ////////////////////////////////////////////////////////////////////
 
+#include <time.h>
+
 typedef struct {
   D3DFORMAT d3d_format;
   int bits_per_pixel;