diff --git a/tests/cases/compiler/unionSignaturesWithThisParameter.ts b/tests/cases/compiler/unionSignaturesWithThisParameter.ts
new file mode 100644
index 00000000000..c983ff1a99c
--- /dev/null
+++ b/tests/cases/compiler/unionSignaturesWithThisParameter.ts
@@ -0,0 +1,13 @@
+// @strict: true
+
+// Repro from #20802
+
+function x<T>(ctor: {
+    (this: {}, v: T): void;
+    new(v: T): void;
+} | {
+    (v: T): void;
+    new(v: T): void;
+}, t: T) {
+    new ctor(t);
+}