diff --git a/nsprpub/pr/include/md/_bsdi.cfg b/nsprpub/pr/include/md/_bsdi.cfg
index 335baf4e4c0..8edf411ce50 100644
--- a/nsprpub/pr/include/md/_bsdi.cfg
+++ b/nsprpub/pr/include/md/_bsdi.cfg
@@ -29,7 +29,7 @@
 
 #define IS_LITTLE_ENDIAN 1
 #undef  IS_BIG_ENDIAN
-#undef  HAVE_LONG_LONG
+#define HAVE_LONG_LONG
 #undef	HAVE_ALIGNED_DOUBLES
 #undef	HAVE_ALIGNED_LONGLONGS