diff --git a/mach/sun3/Action b/mach/sun3/Action
index d79f095a9..a6359a345 100644
--- a/mach/sun3/Action
+++ b/mach/sun3/Action
@@ -8,6 +8,7 @@ name "Sun 3 M68020 C libraries"
 dir libcc
 end
 name "Sun 3 M68020 Occam libraries"
+system "sun*|vax_bsd4_2"
 dir liboc
 end
 name "Sun 3 M68020 Modula-2 libraries"