diff --git a/lib/setup.h b/lib/setup.h
index 4b2bb6c7c..d5614199e 100644
--- a/lib/setup.h
+++ b/lib/setup.h
@@ -230,6 +230,7 @@ typedef unsigned char bool;
 #else /* WIN32 */
 
 #ifdef DJGPP
+#include <sys/ioctl.h>
 #define sclose(x)         close_s(x)
 #define sread(x,y,z)      read_s(x,y,z)
 #define swrite(x,y,z)     write_s(x,y,z)