diff --git a/src/aeso_ast_infer_types.erl b/src/aeso_ast_infer_types.erl
index 565c34d..fcca92f 100644
--- a/src/aeso_ast_infer_types.erl
+++ b/src/aeso_ast_infer_types.erl
@@ -1440,18 +1440,13 @@ infer_prefix({IntOp,As}) when IntOp =:= '-' ->
 abort_expr(Ann, Str) ->
     {app, Ann, {id, Ann, "abort"}, [{string, Ann, Str}]}.
 
-free_vars({int, _, _}) ->
-    [];
-free_vars({char, _, _}) ->
-    [];
-free_vars({string, _, _}) ->
-    [];
-free_vars({bool, _, _}) ->
-    [];
-free_vars(Id={id, _, _}) ->
-    [Id];
-free_vars({con, _, _}) ->
-    [];
+free_vars({int, _, _})    -> [];
+free_vars({char, _, _})   -> [];
+free_vars({string, _, _}) -> [];
+free_vars({bool, _, _})   -> [];
+free_vars(Id={id, _, _})  -> [Id];
+free_vars({con, _, _})    -> [];
+free_vars({qcon, _, _})   -> [];
 free_vars({tuple, _, Cpts}) ->
     free_vars(Cpts);
 free_vars({list, _, Elems}) ->
@@ -1460,6 +1455,8 @@ free_vars({app, _, {'::', _}, Args}) ->
     free_vars(Args);
 free_vars({app, _, {con, _, _}, Args}) ->
     free_vars(Args);
+free_vars({app, _, {qcon, _, _}, Args}) ->
+    free_vars(Args);
 free_vars({record, _, Fields}) ->
     free_vars([E || {field, _, _, E} <- Fields]);
 free_vars({typed, _, A, _}) ->
diff --git a/src/aeso_parser.erl b/src/aeso_parser.erl
index e03224c..de9dcc6 100644
--- a/src/aeso_parser.erl
+++ b/src/aeso_parser.erl
@@ -545,7 +545,7 @@ list_comp_e(Ann, Expr, Binds) -> {list_comp, Ann, Expr, Binds}.
 -spec parse_pattern(aeso_syntax:expr()) -> aeso_parse_lib:parser(aeso_syntax:pat()).
 parse_pattern({app, Ann, Con = {'::', _}, Es}) ->
     {app, Ann, Con, lists:map(fun parse_pattern/1, Es)};
-parse_pattern({app, Ann, Con = {con, _, _}, Es}) ->
+parse_pattern({app, Ann, Con = {Tag, _, _}, Es}) when Tag == con; Tag == qcon ->
     {app, Ann, Con, lists:map(fun parse_pattern/1, Es)};
 parse_pattern({tuple, Ann, Es}) ->
     {tuple, Ann, lists:map(fun parse_pattern/1, Es)};
@@ -554,6 +554,7 @@ parse_pattern({list, Ann, Es}) ->
 parse_pattern({record, Ann, Fs}) ->
     {record, Ann, lists:map(fun parse_field_pattern/1, Fs)};
 parse_pattern(E = {con, _, _})    -> E;
+parse_pattern(E = {qcon, _, _})   -> E;
 parse_pattern(E = {id, _, _})     -> E;
 parse_pattern(E = {int, _, _})    -> E;
 parse_pattern(E = {bool, _, _})   -> E;
diff --git a/test/aeso_compiler_tests.erl b/test/aeso_compiler_tests.erl
index c5912cd..b4d400e 100644
--- a/test/aeso_compiler_tests.erl
+++ b/test/aeso_compiler_tests.erl
@@ -161,7 +161,8 @@ compilable_contracts() ->
      "list_comp",
      "payable",
      "unapplied_builtins",
-     "underscore_number_literals"
+     "underscore_number_literals",
+     "qualified_constructor"
     ].
 
 not_yet_compilable(fate) -> [];
diff --git a/test/contracts/qualified_constructor.aes b/test/contracts/qualified_constructor.aes
new file mode 100644
index 0000000..31a77a5
--- /dev/null
+++ b/test/contracts/qualified_constructor.aes
@@ -0,0 +1,8 @@
+namespace Foo =
+  datatype x = A | B(int)
+
+contract Bar =
+  entrypoint f(a : Foo.x) =
+    switch(a)
+      Foo.A     => 0
+      Foo.B(n)  => n