diff --git a/Userland/Libraries/LibGfx/Bitmap.h b/Userland/Libraries/LibGfx/Bitmap.h
index 8b61a7d5faa..75369b2ddea 100644
--- a/Userland/Libraries/LibGfx/Bitmap.h
+++ b/Userland/Libraries/LibGfx/Bitmap.h
@@ -177,6 +177,20 @@ public:
     void fill(Color);
 
     [[nodiscard]] bool has_alpha_channel() const { return m_format == BitmapFormat::BGRA8888 || m_format == BitmapFormat::RGBA8888; }
+    void add_alpha_channel()
+    {
+        switch (m_format) {
+        case BitmapFormat::BGRx8888:
+            m_format = BitmapFormat::BGRA8888;
+            break;
+        case BitmapFormat::RGBA8888:
+        case BitmapFormat::BGRA8888:
+            // Nothing to do.
+            break;
+        case BitmapFormat::Invalid:
+            VERIFY_NOT_REACHED();
+        }
+    }
     [[nodiscard]] BitmapFormat format() const { return m_format; }
 
     // Call only for BGRx8888 and BGRA8888 bitmaps.
diff --git a/Userland/Libraries/LibPDF/Renderer.cpp b/Userland/Libraries/LibPDF/Renderer.cpp
index ed4fa40e212..bde2d63a569 100644
--- a/Userland/Libraries/LibPDF/Renderer.cpp
+++ b/Userland/Libraries/LibPDF/Renderer.cpp
@@ -986,6 +986,7 @@ PDFErrorOr<void> Renderer::show_image(NonnullRefPtr<StreamObject> image)
         if (smask_bitmap->size() != image_bitmap->size())
             smask_bitmap = TRY(smask_bitmap->scaled_to_size(image_bitmap->size()));
 
+        image_bitmap->add_alpha_channel();
         for (int j = 0; j < image_bitmap->height(); ++j) {
             for (int i = 0; i < image_bitmap->width(); ++i) {
                 auto image_color = image_bitmap->get_pixel(i, j);