diff --git a/packages/concerto-cto/test/cto/bad/map.bad.cto b/packages/concerto-cto/test/cto/bad/map.bad.cto
new file mode 100644
index 000000000..8d4c164bb
--- /dev/null
+++ b/packages/concerto-cto/test/cto/bad/map.bad.cto
@@ -0,0 +1,11 @@
+namespace com.acme@1.0.0
+
+map Library {
+  o String
+  o String
+  o Dictionary
+}
+
+concept Concept {
+  o Library library
+}
diff --git a/packages/concerto-cto/test/parserMain.js b/packages/concerto-cto/test/parserMain.js
index a0b0c58a2..b7c29560c 100644
--- a/packages/concerto-cto/test/parserMain.js
+++ b/packages/concerto-cto/test/parserMain.js
@@ -65,6 +65,15 @@ describe('parser', () => {
         );
     });
 
+    describe('maps', () => {
+        it('Should not parse bad map type', () => {
+            let content = fs.readFileSync('./test/cto/bad/map.bad.cto', 'utf8');
+            (() => {
+                Parser.parse(content);
+            }).should.throw(/Expected .+ but /);
+        });
+    });
+
     describe('identifiers', () => {
 
         const acceptedIdentifiers = [