diff --git a/Services/ImageDecoder/CMakeLists.txt b/Services/ImageDecoder/CMakeLists.txt
index e4ea770236b77..77abf39668dba 100644
--- a/Services/ImageDecoder/CMakeLists.txt
+++ b/Services/ImageDecoder/CMakeLists.txt
@@ -23,3 +23,9 @@ target_include_directories(imagedecoderservice PRIVATE ${LADYBIRD_SOURCE_DIR}/Se
 
 target_link_libraries(ImageDecoder PRIVATE imagedecoderservice LibCore LibMain)
 target_link_libraries(imagedecoderservice PRIVATE LibCore LibGfx LibIPC LibImageDecoderClient LibMain LibThreading)
+
+if (WIN32)
+    find_package(pthread REQUIRED)
+    target_include_directories(ImageDecoder PRIVATE ${PTHREAD_INCLUDE_DIR})
+    target_include_directories(imagedecoderservice PRIVATE ${PTHREAD_INCLUDE_DIR})
+endif()
diff --git a/Services/ImageDecoder/ConnectionFromClient.cpp b/Services/ImageDecoder/ConnectionFromClient.cpp
index 67e4b600f9d44..048b1619883ee 100644
--- a/Services/ImageDecoder/ConnectionFromClient.cpp
+++ b/Services/ImageDecoder/ConnectionFromClient.cpp
@@ -48,8 +48,8 @@ ErrorOr<IPC::File> ConnectionFromClient::connect_new_client()
 
     auto client_socket_or_error = Core::LocalSocket::adopt_fd(socket_fds[0]);
     if (client_socket_or_error.is_error()) {
-        close(socket_fds[0]);
-        close(socket_fds[1]);
+        (void)Core::System::close(socket_fds[0]);
+        (void)Core::System::close(socket_fds[1]);
         return client_socket_or_error.release_error();
     }