diff --git a/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.idl b/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.idl
index c04c36429f..3e2b43e72f 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.idl
+++ b/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.idl
@@ -57,7 +57,7 @@ interface DOMMatrixReadOnly {
     // FIXME: [NewObject] Float64Array toFloat64Array();
 
     [Exposed=Window] stringifier;
-    // FIXME: [Default] object toJSON();
+    [Default] object toJSON();
 };
 
 dictionary DOMMatrix2DInit {
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.idl b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.idl
index 302f3ad8f3..4e3e5475e6 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.idl
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.idl
@@ -14,7 +14,7 @@ interface DOMPointReadOnly {
 
     // FIXME: DOMPoint matrixTransform(optional DOMMatrixInit matrix = {});
 
-    // FIXME: [Default] object toJSON();
+    [Default] object toJSON();
 };
 
 dictionary DOMPointInit {