diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index 343f64be48361..08c28c9ea098f 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -952,8 +952,8 @@ namespace ts {
                                     member.type,
                                     /*initializer*/ undefined
                                 );
-                                setCommentRange(updated, node);
-                                setSourceMapRange(updated, node);
+                                setCommentRange(updated, member);
+                                setSourceMapRange(updated, member);
                                 return updated;
                             }
                             return member;
diff --git a/tests/baselines/reference/classConstructorParametersCommentPlacement.js b/tests/baselines/reference/classConstructorParametersCommentPlacement.js
new file mode 100644
index 0000000000000..31d9e14cb1221
--- /dev/null
+++ b/tests/baselines/reference/classConstructorParametersCommentPlacement.js
@@ -0,0 +1,27 @@
+//// [classConstructorParametersCommentPlacement.ts]
+// some comment
+class A {
+    #a = "private hello";
+    #b = "another private name";
+    a = "public property";
+    constructor(private b = "something") { }
+}
+
+
+//// [classConstructorParametersCommentPlacement.js]
+var _classPrivateFieldSet = function (receiver, privateMap, value) { if (!privateMap.has(receiver)) { throw new TypeError("attempted to set private field on non-instance"); } privateMap.set(receiver, value); return value; };
+var _a, _b;
+// some comment
+var A = /** @class */ (function () {
+    function A(b) {
+        if (b === void 0) { b = "something"; }
+        _a.set(this, void 0);
+        _b.set(this, void 0);
+        this.b = b;
+        _classPrivateFieldSet(this, _a, "private hello");
+        _classPrivateFieldSet(this, _b, "another private name");
+        this.a = "public property";
+    }
+    return A;
+}());
+_a = new WeakMap(), _b = new WeakMap();
diff --git a/tests/baselines/reference/classConstructorParametersCommentPlacement.symbols b/tests/baselines/reference/classConstructorParametersCommentPlacement.symbols
new file mode 100644
index 0000000000000..110e1571bef80
--- /dev/null
+++ b/tests/baselines/reference/classConstructorParametersCommentPlacement.symbols
@@ -0,0 +1,18 @@
+=== tests/cases/conformance/classes/constructorDeclarations/classConstructorParametersCommentPlacement.ts ===
+// some comment
+class A {
+>A : Symbol(A, Decl(classConstructorParametersCommentPlacement.ts, 0, 0))
+
+    #a = "private hello";
+>#a : Symbol(A.#a, Decl(classConstructorParametersCommentPlacement.ts, 1, 9))
+
+    #b = "another private name";
+>#b : Symbol(A.#b, Decl(classConstructorParametersCommentPlacement.ts, 2, 25))
+
+    a = "public property";
+>a : Symbol(A.a, Decl(classConstructorParametersCommentPlacement.ts, 3, 32))
+
+    constructor(private b = "something") { }
+>b : Symbol(A.b, Decl(classConstructorParametersCommentPlacement.ts, 5, 16))
+}
+
diff --git a/tests/baselines/reference/classConstructorParametersCommentPlacement.types b/tests/baselines/reference/classConstructorParametersCommentPlacement.types
new file mode 100644
index 0000000000000..f5b0cf9c9c244
--- /dev/null
+++ b/tests/baselines/reference/classConstructorParametersCommentPlacement.types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/classes/constructorDeclarations/classConstructorParametersCommentPlacement.ts ===
+// some comment
+class A {
+>A : A
+
+    #a = "private hello";
+>#a : string
+>"private hello" : "private hello"
+
+    #b = "another private name";
+>#b : string
+>"another private name" : "another private name"
+
+    a = "public property";
+>a : string
+>"public property" : "public property"
+
+    constructor(private b = "something") { }
+>b : string
+>"something" : "something"
+}
+
diff --git a/tests/cases/conformance/classes/constructorDeclarations/classConstructorParametersCommentPlacement.ts b/tests/cases/conformance/classes/constructorDeclarations/classConstructorParametersCommentPlacement.ts
new file mode 100644
index 0000000000000..958d890f9c9e2
--- /dev/null
+++ b/tests/cases/conformance/classes/constructorDeclarations/classConstructorParametersCommentPlacement.ts
@@ -0,0 +1,8 @@
+
+// some comment
+class A {
+    #a = "private hello";
+    #b = "another private name";
+    a = "public property";
+    constructor(private b = "something") { }
+}