diff --git a/test/data/berlin.jpeg b/test/data/berlin.jpeg
index c305027..2605b81 100644
--- a/test/data/berlin.jpeg
+++ b/test/data/berlin.jpeg
@@ -1,2 +1,2 @@
-I am not even binary!
+ÿØÿØI am not even binary!
 The idea is to test pdfinfo.get_pagecount
\ No newline at end of file
diff --git a/test/data/berlin.jpg b/test/data/berlin.jpg
index 6c06761..8e5a3dd 100644
--- a/test/data/berlin.jpg
+++ b/test/data/berlin.jpg
@@ -1 +1 @@
-well... I am text! But who cares? The idea is to test pdfinfo.get_pagecount
\ No newline at end of file
+ÿØÿîwell... I am text! But who cares? The idea is to test pdfinfo.get_pagecount
\ No newline at end of file
diff --git a/test/data/berlin.png b/test/data/berlin.png
index 6c06761..8114ee1 100644
--- a/test/data/berlin.png
+++ b/test/data/berlin.png
@@ -1 +1,3 @@
+‰PNG
+
 well... I am text! But who cares? The idea is to test pdfinfo.get_pagecount
\ No newline at end of file