diff --git a/app/Models/Study.php b/app/Models/Study.php
index 89d7919..59aac05 100644
--- a/app/Models/Study.php
+++ b/app/Models/Study.php
@@ -26,7 +26,7 @@ class Study extends BaseModel implements HasMedia
     use InteractsWithMedia;
 
     public const string MEDIA_COLLECTION = 'attachments';
-    public const string FALLBACK_IMAGE = 'imgs/pdf.png';
+    public const string FALLBACK_IMAGE = 'imgs/doc-pdf.png';
 
     public function details(): HasOne
     {
diff --git a/app/helpers.php b/app/helpers.php
index 1fa6d4b..05e783e 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -1,5 +1,6 @@
 <?php
 
+use App\Models\Study;
 use App\Models\User;
 use App\Services\AuditTrail\ActivityLogger;
 use Spatie\MediaLibrary\MediaCollections\Models\Media;
@@ -105,10 +106,10 @@ function chomp(string $s, int $len, int $right = 6): string
     function thumb_url(Media $media): string
     {
         if ($media->mime_type === 'application/pdf') {
-            return asset('imgs/pdf.png');
+            return asset(Study::FALLBACK_IMAGE);
         }
 
-        return $media->getUrl('tn') ?? asset('imgs/pdf.png');
+        return $media->getUrl('tn') ?? asset(Study::FALLBACK_IMAGE);
     }
 }
 
diff --git a/public/imgs/pdf.png b/resources/imgs/doc-pdf.png
similarity index 100%
rename from public/imgs/pdf.png
rename to resources/imgs/doc-pdf.png
diff --git a/resources/imgs/pdf.png b/resources/imgs/pdf.png
deleted file mode 100644
index 39d5881..0000000
Binary files a/resources/imgs/pdf.png and /dev/null differ