diff --git a/src/Extensions/MarkdownImageExtension.php b/src/Extensions/MarkdownImageExtension.php
index d48889f..7bc1a08 100644
--- a/src/Extensions/MarkdownImageExtension.php
+++ b/src/Extensions/MarkdownImageExtension.php
@@ -28,7 +28,7 @@ public function onDocumentParsed(DocumentParsedEvent $event): void
             }
 
             // if this isn't an external image, set the prefix
-            if (! Str::startsWith($node->getUrl(), 'http')) {
+            if (! Str::startsWith($node->getUrl(), ['http://', 'https://'])) {
                 $originalUrl = $node->getUrl();
                 $node->setUrl(route('prezet.image', $originalUrl, false));