diff --git a/rotation.cpp b/rotation.cpp
index 2121c2d..f43b468 100644
--- a/rotation.cpp
+++ b/rotation.cpp
@@ -266,7 +266,6 @@ Image* rotate(Image const& src, double angle)
   int64_t const src_qheight = (int64_t) src.height * q_pos;
 
   unsigned int const src_limit = src.width * src.height * src.pixel_size;
-  size_t const buffer_step = rotated->pixel_size;
   int const width = rotated->width;
   int const height = rotated->height;
 
@@ -287,7 +286,7 @@ Image* rotate(Image const& src, double angle)
       }
 
       src_rotated_point += qdx;
-      buffer_index += buffer_step;
+      buffer_index += 1; // pixel_size
     }
   }