1 files changed, 3 insertions, 2 deletions
diff --git a/build2/cc/msvc.cxx b/build2/cc/msvc.cxx
index 993065d..b7b5828 100644
--- a/build2/cc/msvc.cxx
+++ b/build2/cc/msvc.cxx
@@ -329,12 +329,13 @@ namespace build2
           if (!exist)
           {
             if (l.owns_lock ())
+            {
               s->member = i;
+              l.unlock ();
+            }
             else
               assert (s->member == i);
 
-            l.unlock ();
-
             // Presumably there is a DLL somewhere, we just don't know where.
             //
             s->mtime (i->mtime ());