--- include/pub_tool_basics_asm.h.orig
+++ include/pub_tool_basics_asm.h
@@ -46,7 +46,7 @@
 
 #define VGAPPEND(str1,str2) str1##str2
  
-#if defined(VGO_linux) || defined(VGO_solaris) || defined(VGO_freebsd)
+#if defined(VGO_linux) || defined(VGO_solaris) || defined(VGO_freebsd) || defined(VGO_openbsd)
 #  define VG_(str)    VGAPPEND( vgPlain_,          str)
 #  define ML_(str)    VGAPPEND( vgModuleLocal_,    str)
 #elif defined(VGO_darwin)
