diff --git a/OpenCL/inc_rp.cl b/OpenCL/inc_rp.cl
index f263d281a..0365d59dc 100644
--- a/OpenCL/inc_rp.cl
+++ b/OpenCL/inc_rp.cl
@@ -116,6 +116,7 @@ static void append_block (const u32 *buf_src, const int off_src, u32 *buf_dst, c
 
   switch (left)
   {
+    case 4: append_four_byte  (buf_src, off_src + i, buf_dst, off_dst + i); break;
     case 3: append_three_byte (buf_src, off_src + i, buf_dst, off_dst + i); break;
     case 2: append_two_byte   (buf_src, off_src + i, buf_dst, off_dst + i); break;
     case 1: append_one_byte   (buf_src, off_src + i, buf_dst, off_dst + i); break;
diff --git a/src/rp_kernel_on_cpu.c b/src/rp_kernel_on_cpu.c
index 2d6f30037..27927644e 100644
--- a/src/rp_kernel_on_cpu.c
+++ b/src/rp_kernel_on_cpu.c
@@ -141,6 +141,7 @@ static void append_block (const u32 *buf_src, const int off_src, u32 *buf_dst, c
 
   switch (left)
   {
+    case 4: append_four_byte  (buf_src, off_src + i, buf_dst, off_dst + i); break;
     case 3: append_three_byte (buf_src, off_src + i, buf_dst, off_dst + i); break;
     case 2: append_two_byte   (buf_src, off_src + i, buf_dst, off_dst + i); break;
     case 1: append_one_byte   (buf_src, off_src + i, buf_dst, off_dst + i); break;