diff --git a/pandatool/src/maxegg/maxToEgg.cxx b/pandatool/src/maxegg/maxToEgg.cxx
index 4a5ea36b97..af0661d151 100755
--- a/pandatool/src/maxegg/maxToEgg.cxx
+++ b/pandatool/src/maxegg/maxToEgg.cxx
@@ -7,6 +7,7 @@
 
 //Our headers, which in turn includes some Max headers. 
 #include "maxToEgg.h"
+#include "errno.h"
 
 //Member Function Definitions
 /* ~MaxToEgg() - Uninteresting destructor.