diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
index 0b4c3eaf969..c53cfa63a5a 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
@@ -1992,6 +1992,14 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@@overload_suffi
     [[maybe_unused]] auto& realm = *vm.current_realm();
 )~~~");
 
+    // NOTE: Create a wrapper lambda so that if the function steps return an exception, we can return that in a rejected promise.
+    if (function.return_type->name() == "Promise"sv) {
+        function_generator.append(R"~~~(
+    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
+        (void)realm;
+)~~~");
+    }
+
     if (is_static_function == StaticFunction::No) {
         function_generator.append(R"~~~(
     auto* impl = TRY(impl_from(vm));
@@ -2053,6 +2061,26 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@@overload_suffi
 )~~~");
     }
 
+    if (function.return_type->name() == "Promise"sv) {
+        // https://webidl.spec.whatwg.org/#dfn-create-operation-function
+        // If we had an exception running the steps and are meant to return a Promise, wrap that exception in a rejected promise.
+        function_generator.append(R"~~~(
+        return retval;
+    };
+
+    auto maybe_retval = steps();
+
+    // And then, if an exception E was thrown:
+    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
+    // 2. Otherwise, end these steps and allow the exception to propagate.
+    // NOTE: We know that this is a Promise return type statically by the IDL.
+    if (maybe_retval.is_throw_completion())
+        return WebIDL::create_rejected_promise(realm, maybe_retval.error_value())->promise();
+
+    auto retval = maybe_retval.release_value();
+)~~~");
+    }
+
     generate_return_statement(generator, *function.return_type, interface);
 
     function_generator.append(R"~~~(
diff --git a/Tests/LibWeb/Text/expected/wpt-import/streams/readable-byte-streams/read-min.any.txt b/Tests/LibWeb/Text/expected/wpt-import/streams/readable-byte-streams/read-min.any.txt
index 3425da19bb8..15d8b121814 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/streams/readable-byte-streams/read-min.any.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/streams/readable-byte-streams/read-min.any.txt
@@ -6,11 +6,10 @@ Rerun
 
 Found 24 tests
 
-23 Pass
-1 Fail
+24 Pass
 Details
 Result	Test Name	MessagePass	ReadableStream with byte source: read({ min }) rejects if min is 0	
-Fail	ReadableStream with byte source: read({ min }) rejects if min is negative	
+Pass	ReadableStream with byte source: read({ min }) rejects if min is negative	
 Pass	ReadableStream with byte source: read({ min }) rejects if min is larger than view's length (Uint8Array)	
 Pass	ReadableStream with byte source: read({ min }) rejects if min is larger than view's length (Uint16Array)	
 Pass	ReadableStream with byte source: read({ min }) rejects if min is larger than view's length (DataView)