diff --git a/scsh/solaris/stdio_dep.c b/scsh/solaris/stdio_dep.c
index 4913d14..00f35fd 100644
--- a/scsh/solaris/stdio_dep.c
+++ b/scsh/solaris/stdio_dep.c
@@ -26,6 +26,11 @@
 #include "libcig.h"
 #include <errno.h>
 
+/* somewhere around solaris 2.5 this changed to a function */
+#ifndef fileno
+#define fileno(p)       ((p)->_file)
+#endif
+
 #include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
 
 /* These two procs return #t if data ready, #f data not ready,