diff --git a/shortcuts.c b/shortcuts.c
index 3908167..b806637 100644
--- a/shortcuts.c
+++ b/shortcuts.c
@@ -495,13 +495,16 @@ sc_scroll(girara_session_t* session, girara_argument_t* argument,
     t = 1;
   }
 
-  unsigned int view_width=0, view_height=0;
+  unsigned int view_width  = 0;
+  unsigned int view_height = 0;
   zathura_document_get_viewport_size(zathura->document, &view_height, &view_width);
 
-  unsigned int cell_width=0, cell_height=0;
+  unsigned int cell_width  = 0;
+  unsigned int cell_height = 0;
   zathura_document_get_cell_size(zathura->document, &cell_height, &cell_width);
 
-  unsigned int doc_width=0, doc_height=0;
+  unsigned int doc_width  = 0;
+  unsigned int doc_height = 0;
   zathura_document_get_document_size(zathura->document, &doc_height, &doc_width);
 
   float scroll_step = 40;
@@ -544,8 +547,8 @@ sc_scroll(girara_session_t* session, girara_argument_t* argument,
     direction = 1.0;
   }
 
-  double vstep = (double)(cell_height + padding) / (double)doc_height;
-  double hstep = (double)(cell_width + padding) / (double)doc_width;
+  const double vstep = (double)(cell_height + padding) / (double)doc_height;
+  const double hstep = (double)(cell_width + padding) / (double)doc_width;
 
   /* compute new position */
   switch(argument->n) {