diff --git a/include/mp/flat/constr_2_expr.h b/include/mp/flat/constr_2_expr.h
index 81bc5f500..8c7b929de 100644
--- a/include/mp/flat/constr_2_expr.h
+++ b/include/mp/flat/constr_2_expr.h
@@ -284,8 +284,9 @@ class Constraints2Expr {
 
   bool HasExpressionArgs(const LinTerms& lt) const {
     for (auto v: lt.vars())
-      if (!MPCD( IsProperVar(v) ))
+      if (!MPCD( IsProperVar(v) )) {
         return true;
+      }
     return false;
   }
 
@@ -415,9 +416,9 @@ class Constraints2Expr {
     result.reserve(ltin.size() - nvars);
     int v=0;
     for (size_t i=0; i<ltin.size(); ++i) {
-      if (MPCD( IsProperVar(v = ltin.var(i)) ))
+      if (MPCD( IsProperVar(v = ltin.var(i)) )) {
         lt_out_vars.add_term(ltin.coef(i), v);
-      else
+      } else
         result.add_term(ltin.coef(i), v);
     }
     return result;
diff --git a/include/mp/flat/constr_keeper.h b/include/mp/flat/constr_keeper.h
index 4db7e9503..116a56797 100644
--- a/include/mp/flat/constr_keeper.h
+++ b/include/mp/flat/constr_keeper.h
@@ -379,7 +379,10 @@ class ConstraintKeeper final
   }
 
   void DoCvtWithExprs() {
-    auto cal = GetChosenAcceptanceLevel();
+    // For acc:_all=0 to work, we have to accept non-convertible con types
+    auto cal = IfConverterConverts(GetConverter())
+                   ? GetChosenAcceptanceLevel()
+                   : ConstraintAcceptanceLevel::Recommended;
     auto eal = GetChosenAcceptanceLevelEXPR();
     ForEachActive(
         [this, cal, eal](const auto& con, int i) {
@@ -390,7 +393,7 @@ class ConstraintKeeper final
 	/// Call Converter's RunConversion() and mark as "bridged".
   ///
 	/// @param cnt the constraint container -
-	/// actually redundant, as \a i is enough to find it. But for speed.
+  ///   actually redundant, as \a i is enough to find it. But for speed.
   /// @param i constraint index, needed for bridging
   void ConvertConstraint(Container& cnt, int i) {
     assert(!cnt.IsBridged());