diff --git a/src/pool/PoolSQL.cc b/src/pool/PoolSQL.cc
index 7bdf1c5a80..832e616896 100644
--- a/src/pool/PoolSQL.cc
+++ b/src/pool/PoolSQL.cc
@@ -275,11 +275,11 @@ void PoolSQL::clean()
         it->second->lock();
         
         delete it->second;
-        
-        pool.erase(it);
     }
 
-    unlock();   
+    pool.clear();
+
+    unlock();
 }
 
 /* -------------------------------------------------------------------------- */