diff --git a/src/rules/noPrimitiveConstructorTypes.js b/src/rules/noPrimitiveConstructorTypes.js
index 086828d6..6c1c9efb 100644
--- a/src/rules/noPrimitiveConstructorTypes.js
+++ b/src/rules/noPrimitiveConstructorTypes.js
@@ -6,7 +6,7 @@ export default {
       GenericTypeAnnotation: (node) => {
         const name = _.get(node, 'id.name');
 
-        if (RegExp(/(Boolean|Number|String)/).test(name)) {
+        if (RegExp(/^(Boolean|Number|String)$/).test(name)) {
           context.report({
             data: {
               name
diff --git a/tests/rules/assertions/noPrimitiveConstructorTypes.js b/tests/rules/assertions/noPrimitiveConstructorTypes.js
index 2d9ae0b3..4af2e30d 100644
--- a/tests/rules/assertions/noPrimitiveConstructorTypes.js
+++ b/tests/rules/assertions/noPrimitiveConstructorTypes.js
@@ -64,6 +64,15 @@ export default {
     },
     {
       code: '(x: boolean) => {}'
+    },
+    {
+      code: 'type x = MyNumber'
+    },
+    {
+      code: 'type x = MyString'
+    },
+    {
+      code: 'type x = MyBoolean'
     }
   ]
 };