diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 650bc488b0e..ba866c867e9 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -8392,7 +8392,7 @@ namespace ts {
             if (needToCaptureLexicalThis) {
                 captureLexicalThis(node, container);
             }
-            if (isFunctionLike(container)) {
+            if (isFunctionLike(container) && !isInParameterInitializerBeforeContainingFunction(node)) {
                 // If this is a function in a JS file, it might be a class method. Check if it's the RHS
                 // of a x.prototype.y = function [name]() { .... }
                 if (container.kind === SyntaxKind.FunctionExpression &&
diff --git a/tests/baselines/reference/inferParameterWithMethodCallInitializer.js b/tests/baselines/reference/inferParameterWithMethodCallInitializer.js
new file mode 100644
index 00000000000..6a5400ca19a
--- /dev/null
+++ b/tests/baselines/reference/inferParameterWithMethodCallInitializer.js
@@ -0,0 +1,30 @@
+//// [inferParameterWithMethodCallInitializer.ts]
+function getNumber(): number {
+    return 1;
+}
+class Example {
+    getNumber(): number {
+        return 1;
+    }
+    doSomething(a = this.getNumber()): typeof a {
+        return a;
+    }
+}
+
+
+//// [inferParameterWithMethodCallInitializer.js]
+function getNumber() {
+    return 1;
+}
+var Example = (function () {
+    function Example() {
+    }
+    Example.prototype.getNumber = function () {
+        return 1;
+    };
+    Example.prototype.doSomething = function (a) {
+        if (a === void 0) { a = this.getNumber(); }
+        return a;
+    };
+    return Example;
+}());
diff --git a/tests/baselines/reference/inferParameterWithMethodCallInitializer.symbols b/tests/baselines/reference/inferParameterWithMethodCallInitializer.symbols
new file mode 100644
index 00000000000..e4318fe1ead
--- /dev/null
+++ b/tests/baselines/reference/inferParameterWithMethodCallInitializer.symbols
@@ -0,0 +1,27 @@
+=== tests/cases/compiler/inferParameterWithMethodCallInitializer.ts ===
+function getNumber(): number {
+>getNumber : Symbol(getNumber, Decl(inferParameterWithMethodCallInitializer.ts, 0, 0))
+
+    return 1;
+}
+class Example {
+>Example : Symbol(Example, Decl(inferParameterWithMethodCallInitializer.ts, 2, 1))
+
+    getNumber(): number {
+>getNumber : Symbol(Example.getNumber, Decl(inferParameterWithMethodCallInitializer.ts, 3, 15))
+
+        return 1;
+    }
+    doSomething(a = this.getNumber()): typeof a {
+>doSomething : Symbol(Example.doSomething, Decl(inferParameterWithMethodCallInitializer.ts, 6, 5))
+>a : Symbol(a, Decl(inferParameterWithMethodCallInitializer.ts, 7, 16))
+>this.getNumber : Symbol(Example.getNumber, Decl(inferParameterWithMethodCallInitializer.ts, 3, 15))
+>this : Symbol(Example, Decl(inferParameterWithMethodCallInitializer.ts, 2, 1))
+>getNumber : Symbol(Example.getNumber, Decl(inferParameterWithMethodCallInitializer.ts, 3, 15))
+>a : Symbol(a, Decl(inferParameterWithMethodCallInitializer.ts, 7, 16))
+
+        return a;
+>a : Symbol(a, Decl(inferParameterWithMethodCallInitializer.ts, 7, 16))
+    }
+}
+
diff --git a/tests/baselines/reference/inferParameterWithMethodCallInitializer.types b/tests/baselines/reference/inferParameterWithMethodCallInitializer.types
new file mode 100644
index 00000000000..53c58e201b7
--- /dev/null
+++ b/tests/baselines/reference/inferParameterWithMethodCallInitializer.types
@@ -0,0 +1,30 @@
+=== tests/cases/compiler/inferParameterWithMethodCallInitializer.ts ===
+function getNumber(): number {
+>getNumber : () => number
+
+    return 1;
+>1 : number
+}
+class Example {
+>Example : Example
+
+    getNumber(): number {
+>getNumber : () => number
+
+        return 1;
+>1 : number
+    }
+    doSomething(a = this.getNumber()): typeof a {
+>doSomething : (a?: number) => number
+>a : number
+>this.getNumber() : number
+>this.getNumber : () => number
+>this : this
+>getNumber : () => number
+>a : number
+
+        return a;
+>a : number
+    }
+}
+