diff --git a/src/build-system.jam b/src/build-system.jam
index 76db2d377..1a3ac7904 100644
--- a/src/build-system.jam
+++ b/src/build-system.jam
@@ -971,7 +971,12 @@ local rule should-clean-project ( project )
         DEPENDS all : $(actual-targets) ;
         if UPDATE_NOW in [ RULENAMES ]
         {
-            local ok = [ UPDATE_NOW all $(.out-xml) ] ;
+            local ok = [ UPDATE_NOW all ] ;
+            # Force sequence updating of regular targets, then the xml
+            # log output target. To ensure the output records all built
+            # as otherwise if could execute out-of-sequence when
+            # doing parallel builds.
+            ok += [ UPDATE_NOW $(.out-xml) : : ignore-minus-n ] ;
             if $(.post-build-hook)
             {
                 $(.post-build-hook) $(ok) ;