diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
index e13daa69b..7b643ca02 100644
--- a/rtengine/dcraw.cc
+++ b/rtengine/dcraw.cc
@@ -2362,7 +2362,6 @@ void CLASS sony_arq_load_raw()
     int bits = 0;
     while (1 << ++bits < maximum)
         ;
-    ++bits;
     bits = (1 << bits) - 1;
 
     for (int row = 0; row < ((frame < 2) ? 1 : raw_height); row++) {
@@ -2376,8 +2375,8 @@ void CLASS sony_arq_load_raw()
         read_shorts(samples, 4 * raw_width);
         if (r < raw_height) {
             int offset = 2 * (r & 1);
-            for (int c = (frame >> 1) & 1; c < raw_width; ++c, offset = (offset + 4) ^ 1) {
-                RAW(r, c) = samples[offset] & bits;
+            for (int c = (frame >> 1) & 1; c < raw_width; ++c, offset += 4) {
+                RAW(r, c) = samples[offset + (c & 1)] & bits;
             }
         }
     }