diff --git a/v1/vacpp-tools.jam b/v1/vacpp-tools.jam
index 36dad4353..02204f72d 100644
--- a/v1/vacpp-tools.jam
+++ b/v1/vacpp-tools.jam
@@ -87,6 +87,11 @@ if ! $(ARFLAGS)
     flags xlc ARFLAGS : "" ;
 }
 
+# Clear the STDHDRS variable which contains /usr/include. Vacpp does not like
+# that this sys directory is included (vacpp related headers are in
+# /usr/vacpp/include)
+STDHDRS = ;
+
 #### Link ####
 
 rule Link-action