diff --git a/TrackingTools/PatternTools/interface/bqueue.h b/TrackingTools/PatternTools/interface/bqueue.h
index 3a188fa42ea31..f3ea002275bec 100644
--- a/TrackingTools/PatternTools/interface/bqueue.h
+++ b/TrackingTools/PatternTools/interface/bqueue.h
@@ -138,6 +138,7 @@ namespace cmsutils {
       cp.m_size = 0;
     }
 
+    bqueue &operator=(bqueue<T> const &) = default;
     bqueue &operator=(bqueue<T> &&cp) noexcept {
       using std::swap;
       swap(m_size, cp.m_size);
diff --git a/TrackingTools/PatternTools/test/bqueue_t.cpp b/TrackingTools/PatternTools/test/bqueue_t.cpp
index a8f490d5f6566..f7431c3a0db6c 100644
--- a/TrackingTools/PatternTools/test/bqueue_t.cpp
+++ b/TrackingTools/PatternTools/test/bqueue_t.cpp
@@ -47,6 +47,15 @@ int main() {
   assert(cont.shared());
   assert(cont3.shared());
   verifySeq(cont3);
+  // copy assign
+  {
+    Cont cont_assign;
+    cont_assign = cont;
+    assert(cont.size() == cont_assign.size());
+    assert(cont.shared());
+    assert(cont_assign.shared());
+    verifySeq(cont_assign);
+  }
   // add
   cont.push_back(Cont::value_type(new int(10)));
   assert((*cont.back()) == 10);