2 files changed, 4 insertions, 2 deletions
diff --git a/odb/details/posix/condition.hxx b/odb/details/posix/condition.hxx
index 6a86741..7a9dd2d 100644
--- a/odb/details/posix/condition.hxx
+++ b/odb/details/posix/condition.hxx
@@ -16,6 +16,8 @@ namespace odb
 {
   namespace details
   {
+    class lock;
+
     class LIBODB_EXPORT condition
     {
     public:
@@ -26,7 +28,7 @@ namespace odb
       signal ();
 
       void
-      wait ();
+      wait (lock&);
 
     private:
       condition (const condition&);
diff --git a/odb/details/posix/condition.ixx b/odb/details/posix/condition.ixx
index 9ebd60e..0aa504b 100644
--- a/odb/details/posix/condition.ixx
+++ b/odb/details/posix/condition.ixx
@@ -30,7 +30,7 @@ namespace odb
     }
 
     inline void condition::
-    wait ()
+    wait (lock&)
     {
       if (int e = pthread_cond_wait (&cond_, &mutex_.mutex_))
         throw posix_exception (e);