diff --git a/src/memfile.c b/src/memfile.c
index d1bc96a577..57c9d92fd2 100644
--- a/src/memfile.c
+++ b/src/memfile.c
@@ -639,7 +639,8 @@ mf_sync(mfp, flags)
 # endif
 	    /* OpenNT is strictly POSIX (Benzinger) */
 	    /* Tandem/Himalaya NSK-OSS doesn't have sync() */
-# if defined(__OPENNT) || defined(__TANDEM)
+	    /* No sync() on Stratus VOS */
+# if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__)
 	    fflush(NULL);
 # else
 	    sync();
diff --git a/src/version.c b/src/version.c
index e74b125e05..38f3b785f9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    644,
 /**/
     643,
 /**/