diff --git a/src/adapters/pdfpages.rs b/src/adapters/pdfpages.rs
index 286c16d..f3ec0e9 100644
--- a/src/adapters/pdfpages.rs
+++ b/src/adapters/pdfpages.rs
@@ -20,7 +20,9 @@ lazy_static! {
 			.iter()
 			.map(|s| FastMatcher::FileExtension(s.to_string()))
 			.collect(),
-		slow_matchers: None
+		slow_matchers: Some(vec![SlowMatcher::MimeType(
+            "application/pdf".to_owned()
+        )])
 	};
 }
 #[derive(Default)]
diff --git a/src/adapters/poppler.rs b/src/adapters/poppler.rs
index c73a7ee..6be887c 100644
--- a/src/adapters/poppler.rs
+++ b/src/adapters/poppler.rs
@@ -17,7 +17,9 @@ lazy_static! {
             .iter()
             .map(|s| FastMatcher::FileExtension(s.to_string()))
             .collect(),
-        slow_matchers: None
+        slow_matchers: Some(vec![SlowMatcher::MimeType(
+            "application/pdf".to_owned()
+        )])
     };
 }
 #[derive(Default)]