diff --git a/libs/vkd3d-shader/d3d_asm.c b/libs/vkd3d-shader/d3d_asm.c
index 197c689d..40daa535 100644
--- a/libs/vkd3d-shader/d3d_asm.c
+++ b/libs/vkd3d-shader/d3d_asm.c
@@ -1626,8 +1626,10 @@ static void shader_dump_instruction(struct vkd3d_d3d_asm_compiler *compiler,
         case VKD3DSIH_DCL_CONSTANT_BUFFER:
             vkd3d_string_buffer_printf(buffer, " ");
             shader_dump_register(compiler, &ins->declaration.cb.src.reg, true);
-            if (shader_ver_ge(&compiler->shader_version, 5, 1))
+            if (shader_ver_ge(&compiler->shader_version, 6, 0))
                 shader_print_subscript(compiler, ins->declaration.cb.size, NULL);
+            else if (shader_ver_ge(&compiler->shader_version, 5, 1))
+                shader_print_subscript(compiler, ins->declaration.cb.size / VKD3D_VEC4_SIZE / sizeof(float), NULL);
             shader_addline(buffer, ", %s",
                     ins->flags & VKD3DSI_INDEXED_DYNAMIC ? "dynamicIndexed" : "immediateIndexed");
             shader_dump_register_space(compiler, ins->declaration.cb.range.space);
diff --git a/libs/vkd3d-shader/tpf.c b/libs/vkd3d-shader/tpf.c
index 845b4423..0ea5a682 100644
--- a/libs/vkd3d-shader/tpf.c
+++ b/libs/vkd3d-shader/tpf.c
@@ -884,6 +884,8 @@ static void shader_sm4_read_dcl_constant_buffer(struct vkd3d_shader_instruction
         ins->declaration.cb.size = *tokens++;
         shader_sm4_read_register_space(priv, &tokens, end, &ins->declaration.cb.range.space);
     }
+
+    ins->declaration.cb.size *= VKD3D_VEC4_SIZE * sizeof(float);
 }
 
 static void shader_sm4_read_dcl_sampler(struct vkd3d_shader_instruction *ins, uint32_t opcode, uint32_t opcode_token,
diff --git a/libs/vkd3d-shader/vkd3d_shader_main.c b/libs/vkd3d-shader/vkd3d_shader_main.c
index 052edeb5..7aaec49f 100644
--- a/libs/vkd3d-shader/vkd3d_shader_main.c
+++ b/libs/vkd3d-shader/vkd3d_shader_main.c
@@ -817,7 +817,7 @@ static void vkd3d_shader_scan_constant_buffer_declaration(struct vkd3d_shader_sc
     if (!(d = vkd3d_shader_scan_add_descriptor(context, VKD3D_SHADER_DESCRIPTOR_TYPE_CBV,
             &cb->src.reg, &cb->range, VKD3D_SHADER_RESOURCE_BUFFER, VKD3D_SHADER_RESOURCE_DATA_UINT)))
         return;
-    d->buffer_size = cb->size * 16;
+    d->buffer_size = cb->size;
 }
 
 static void vkd3d_shader_scan_sampler_declaration(struct vkd3d_shader_scan_context *context,