diff --git a/tests/cases/conformance/types/union/unionTypeCallSignatures.ts b/tests/cases/conformance/types/union/unionTypeCallSignatures.ts
index 1261de3299e..ca599329743 100644
--- a/tests/cases/conformance/types/union/unionTypeCallSignatures.ts
+++ b/tests/cases/conformance/types/union/unionTypeCallSignatures.ts
@@ -25,12 +25,12 @@ unionOfDifferentNumberOfSignatures(); // error - no call signatures
 unionOfDifferentNumberOfSignatures(10); // error - no call signatures
 unionOfDifferentNumberOfSignatures("hello"); // error - no call signatures
 
-    var unionWithDifferentParameterCount: { (a: string): string; } | { (a: string, b: number): number; } ;
+var unionWithDifferentParameterCount: { (a: string): string; } | { (a: string, b: number): number; } ;
 unionWithDifferentParameterCount();// no  call signature
 unionWithDifferentParameterCount("hello");// no  call signature
 unionWithDifferentParameterCount("hello", 10);// no  call signature
 
-    var unionWithOptionalParameter1: { (a: string, b?: number): string; } | { (a: string, b?: number): number; };
+var unionWithOptionalParameter1: { (a: string, b?: number): string; } | { (a: string, b?: number): number; };
 strOrNum = unionWithOptionalParameter1('hello');
 strOrNum = unionWithOptionalParameter1('hello', 10);
 strOrNum = unionWithOptionalParameter1('hello', "hello"); // error in parameter type
@@ -43,7 +43,7 @@ strOrNum = unionWithOptionalParameter2('hello', "hello"); // error no call signa
 strOrNum = unionWithOptionalParameter2(); // error no call signature
 
 var unionWithOptionalParameter3: { (a: string, b?: number): string; } | { (a: string): number; };
-strOrNum = unionWithOptionalParameter3('hello'); // error no call signature
+strOrNum = unionWithOptionalParameter3('hello');
 strOrNum = unionWithOptionalParameter3('hello', 10); // error no call signature
 strOrNum = unionWithOptionalParameter3('hello', "hello"); // error no call signature
 strOrNum = unionWithOptionalParameter3(); // error no call signature
@@ -63,8 +63,9 @@ strOrNum = unionWithRestParameter2('hello', "hello"); // error no call signature
 strOrNum = unionWithRestParameter2(); // error no call signature
 
 var unionWithRestParameter3: { (a: string, ...b: number[]): string; } | { (a: string): number };
-strOrNum = unionWithRestParameter3('hello'); // error no call signature
+strOrNum = unionWithRestParameter3('hello');
 strOrNum = unionWithRestParameter3('hello', 10); // error no call signature
 strOrNum = unionWithRestParameter3('hello', 10, 11); // error no call signature
 strOrNum = unionWithRestParameter3('hello', "hello"); // error no call signature
-strOrNum = unionWithRestParameter3(); // error no call signature
\ No newline at end of file
+strOrNum = unionWithRestParameter3(); // error no call signature
+
diff --git a/tests/cases/conformance/types/union/unionTypeCallSignatures2.ts b/tests/cases/conformance/types/union/unionTypeCallSignatures2.ts
new file mode 100644
index 00000000000..8095f649330
--- /dev/null
+++ b/tests/cases/conformance/types/union/unionTypeCallSignatures2.ts
@@ -0,0 +1,24 @@
+interface A {
+    (x: number): number;
+    (x: string, y?: string): boolean;
+    (x: Date): void;
+    <T>(x: T[]): T[];
+}
+
+interface B {
+    (x: number): number;
+    (x: string): string;
+    (x: Date): void;
+    <T>(x: T[]): T[];
+}
+
+interface C {
+    (x: string, ...y: string[]): number;
+    (x: number, s?: string): number;
+    <T>(x: T[]): T[];
+}
+
+var f: A | B | C;
+var n = f(42);             // number
+var s = f("abc");          // boolean | string | number
+var a = f([true, false]);  // boolean[]