1 files changed, 3 insertions, 1 deletions
diff --git a/odb/details/win32/condition.hxx b/odb/details/win32/condition.hxx
index 56eebf6..be06557 100644
--- a/odb/details/win32/condition.hxx
+++ b/odb/details/win32/condition.hxx
@@ -18,6 +18,8 @@ namespace odb
 {
   namespace details
   {
+    class lock;
+
     class LIBODB_EXPORT condition
     {
     public:
@@ -28,7 +30,7 @@ namespace odb
       signal ();
 
       void
-      wait ();
+      wait (lock&);
 
     private:
       condition (const condition&);