Index: libstdc++-v3/include/bits/forward_list.tcc
===================================================================
--- libstdc++-v3/include/bits/forward_list.tcc	(revision 245686)
+++ libstdc++-v3/include/bits/forward_list.tcc	(working copy)
@@ -451,20 +451,20 @@
                         __p = static_cast<_Node*>(__p->_M_next);
                         --__psize;
                       }
-                    else if (__comp(*__p->_M_valptr(), *__q->_M_valptr()))
+                    else if (__comp(*__q->_M_valptr(), *__p->_M_valptr()))
                       {
+                        // First node of q is lower; e must come from q.
+                        __e = __q;
+                        __q = static_cast<_Node*>(__q->_M_next);
+                        --__qsize;
+                      }
+                    else
+                      {
                         // First node of p is lower; e must come from p.
                         __e = __p;
                         __p = static_cast<_Node*>(__p->_M_next);
                         --__psize;
                       }
-                    else
-                      {
-                        // First node of q is lower; e must come from q.
-                        __e = __q;
-                        __q = static_cast<_Node*>(__q->_M_next);
-                        --__qsize;
-                      }
 
                     // Add the next node to the merged list.
                     if (__tail)