diff --git a/src/core/codestream/ojph_resolution.cpp b/src/core/codestream/ojph_resolution.cpp
index 3a59ef5..965a394 100644
--- a/src/core/codestream/ojph_resolution.cpp
+++ b/src/core/codestream/ojph_resolution.cpp
@@ -586,9 +586,19 @@ namespace ojph {
           else
           {
             // vertical transform
-            si32* sp = aug->line->i32;
-            for (ui32 i = width; i > 0; --i)
-              *sp++ <<= 1;
+            if (aug->line->flags & line_buf::LFT_32BIT)
+            {
+              si32* sp = aug->line->i32;
+              for (ui32 i = width; i > 0; --i)
+                *sp++ <<= 1;
+            }
+            else
+            {
+              assert(aug->line->flags & line_buf::LFT_64BIT);
+              si64* sp = aug->line->i64;
+              for (ui32 i = width; i > 0; --i)
+                *sp++ <<= 1;
+            }
             // horizontal transform
             rev_horz_ana(atk, bands[2].get_line(),
               bands[3].get_line(), aug->line, width, horz_even);