diff --git a/tests/cases/compiler/thisTypeComparison.ts b/tests/cases/compiler/thisTypeComparison.ts
new file mode 100644
index 00000000000..1bbcae9d033
--- /dev/null
+++ b/tests/cases/compiler/thisTypeComparison.ts
@@ -0,0 +1,17 @@
+// @strict: true
+
+class AA {
+    do1() {
+        const b = dd.getB();
+        if (this === b) {
+            console.log("this === b");
+        }
+    }
+}
+
+class BB extends AA {
+    getB(): BB { return this; }
+}
+
+let dd = new BB();
+dd.do1();
\ No newline at end of file