diff --git a/lib/kafs/afssysdefs.h b/lib/kafs/afssysdefs.h
index c394f1bbe..77b2111e0 100644
--- a/lib/kafs/afssysdefs.h
+++ b/lib/kafs/afssysdefs.h
@@ -47,14 +47,18 @@
  * entry point syscalls.
  */
 
-#if SunOS == 4
+#if SunOS == 40
 #define AFS_SYSCALL	31
 #endif
 
-#if SunOS == 5
+#if SunOS >= 50 && SunOS < 57
 #define AFS_SYSCALL	105
 #endif
 
+#if SunOS == 57
+#define AFS_SYSCALL	73
+#endif
+
 #if defined(__hpux)
 #define AFS_SYSCALL	50
 #define AFS_SYSCALL2	49