diff --git a/callbacks.c b/callbacks.c
index e1c835d..a14e077 100644
--- a/callbacks.c
+++ b/callbacks.c
@@ -58,7 +58,7 @@ cb_view_vadjustment_value_changed(GtkAdjustment *adjustment, gpointer data)
     }
 
     double begin = offset->y;
-    double end   = offset->y + page->height;
+    double end   = offset->y + page->height * zathura->document->scale;
 
     if (   ( (begin >= lower) && (end <= upper) ) /* [> page is in viewport <]*/
         || ( (begin <= lower) && (end >= lower) && (end <= upper) ) /* [> end of the page is in viewport <] */
diff --git a/render.c b/render.c
index 32575c6..4d80d57 100644
--- a/render.c
+++ b/render.c
@@ -1,3 +1,7 @@
+/* See LICENSE file for license and copyright information */
+
+#include <math.h>
+
 #include "render.h"
 #include "zathura.h"
 #include "document.h"