diff --git a/NEWS b/NEWS
index 587a69c48..73f9b9cb9 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,9 @@ New in spot 2.7.2.dev (not yet released)
     --stats would output the \r as part of the %> sequence instead
     of ignoring it.
 
+  - Fix serious typo in removel_alternation() causing incorrect
+    output for some VWAA.  Bug introduced in Spot 2.6.
+
 New in spot 2.7.2 (2019-03-17)
 
   Python:
diff --git a/spot/twaalgos/alternation.cc b/spot/twaalgos/alternation.cc
index 290e80f8a..9984ec620 100644
--- a/spot/twaalgos/alternation.cc
+++ b/spot/twaalgos/alternation.cc
@@ -233,7 +233,7 @@ namespace spot
               {
                 int v = d->register_anonymous_variables(1, this);
                 scc_to_var_.emplace_back(v);
-                mark_to_state_.push_back(si_.one_state_of(c));
+                mark_to_state_.push_back(si_.one_state_of(s));
                 var_to_mark_.emplace(v, acc_cond::mark_t({mark_pos++}));
                 bdd bv = bdd_ithvar(v);
                 all_marks &= bv;
@@ -449,7 +449,6 @@ namespace spot
             for (unsigned se: s_to_ss[s])
               bs &= state_as_bdd(se);
 
-
             bdd ap = bdd_exist(bdd_support(bs), all_vars_);
             bdd all_letters = bdd_exist(bs, all_vars_);
 
@@ -468,7 +467,7 @@ namespace spot
                     v.clear();
                     acc_cond::mark_t m = bdd_to_state(dest, v);
 
-                    // if there is no promise "f" is between a state
+                    // if there is no promise "f" between a state
                     // that does not have f, and a state that have
                     // "f", we can add one.  Doing so will help later
                     // simplifications performed by postprocessor.  An
diff --git a/tests/python/alternation.ipynb b/tests/python/alternation.ipynb
index 10be77db2..8fda293bb 100644
--- a/tests/python/alternation.ipynb
+++ b/tests/python/alternation.ipynb
@@ -2770,79 +2770,78 @@
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     "nba2, nba3, nba4, nba5 = [spot.scc_filter(spot.remove_alternation(a, True), True) for a in (aut2, aut3, aut4, aut5)]\n",
     "display_inline(nba2, nba3, nba4, nba5)"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "The following demonstrate that very weak (non-alternating) Büchi automata can be complemented via alternation removal."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
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+       "</g>\n",
+       "<!-- 2&#45;&gt;6 -->\n",
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+       "<title>2&#45;&gt;6</title>\n",
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+       "<title>3&#45;&gt;3</title>\n",
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+       "<title>5&#45;&gt;5</title>\n",
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+       "<g id=\"edge18\" class=\"edge\">\n",
+       "<title>6&#45;&gt;6</title>\n",
+       "<path fill=\"none\" stroke=\"#000000\" d=\"M184.6641,-227.3828C194.625,-229.0234 204,-226.5625 204,-220 204,-215.0781 198.7266,-212.4634 191.8876,-212.1558\"/>\n",
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+       "</g>\n",
+       "</svg>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "<IPython.core.display.HTML object>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "pos = spot.automaton(\"\"\"HOA: v1 name: \"(a & (Fa R XFb)) | (!a & (G!a U\n",
+    "XG!b))\" States: 6 Start: 0 AP: 2 \"a\" \"b\" acc-name: Buchi Acceptance: 1\n",
+    "Inf(0) properties: trans-labels explicit-labels state-acc\n",
+    "semi-deterministic --BODY-- State: 0 [0] 1 [!0] 2 [!0] 3 State: 1 [!1]\n",
+    "1 [1] 4 State: 2 {0} [!1] 2 State: 3 [!0] 3 [!0] 5 State: 4 {0} [t] 4\n",
+    "State: 5 {0} [!0&!1] 5 --END--\"\"\")\n",
+    "altneg = spot.dualize(pos)\n",
+    "neg = spot.remove_alternation(altneg)\n",
+    "display_inline(pos, altneg.show('.bvu'), neg)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Issue #382.\n",
+    "w = spot.parse_word('cycle{!a&b}').as_automaton()\n",
+    "assert pos.intersects(w) != neg.intersects(w)"
+   ]
   }
  ],
  "metadata": {
@@ -3621,7 +4160,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.5"
+   "version": "3.7.3rc1"
   }
  },
  "nbformat": 4,