diff --git a/libs/vkd3d-shader/vkd3d_shader_main.c b/libs/vkd3d-shader/vkd3d_shader_main.c
index 6c9301c2..d2045332 100644
--- a/libs/vkd3d-shader/vkd3d_shader_main.c
+++ b/libs/vkd3d-shader/vkd3d_shader_main.c
@@ -928,13 +928,12 @@ static int vkd3d_shader_scan_instruction(struct vkd3d_shader_scan_context *conte
     return VKD3D_OK;
 }
 
-static int scan_dxbc(const struct vkd3d_shader_compile_info *compile_info,
-        struct vkd3d_shader_message_context *message_context)
+static int scan_with_parser(const struct vkd3d_shader_compile_info *compile_info,
+        struct vkd3d_shader_message_context *message_context, struct vkd3d_shader_parser *parser)
 {
     struct vkd3d_shader_scan_descriptor_info *scan_descriptor_info;
     struct vkd3d_shader_instruction instruction;
     struct vkd3d_shader_scan_context context;
-    struct vkd3d_shader_parser *parser;
     int ret;
 
     if ((scan_descriptor_info = vkd3d_find_struct(compile_info->next, SCAN_DESCRIPTOR_INFO)))
@@ -945,12 +944,6 @@ static int scan_dxbc(const struct vkd3d_shader_compile_info *compile_info,
 
     vkd3d_shader_scan_context_init(&context, compile_info, scan_descriptor_info, message_context);
 
-    if ((ret = vkd3d_shader_sm4_parser_create(compile_info, message_context, &parser)) < 0)
-    {
-        vkd3d_shader_scan_context_cleanup(&context);
-        return ret;
-    }
-
     if (TRACE_ON())
     {
         vkd3d_shader_trace(parser);
@@ -982,7 +975,42 @@ static int scan_dxbc(const struct vkd3d_shader_compile_info *compile_info,
 
 done:
     vkd3d_shader_scan_context_cleanup(&context);
+    return ret;
+}
+
+static int scan_dxbc(const struct vkd3d_shader_compile_info *compile_info,
+        struct vkd3d_shader_message_context *message_context)
+{
+    struct vkd3d_shader_parser *parser;
+    int ret;
+
+    if ((ret = vkd3d_shader_sm4_parser_create(compile_info, message_context, &parser)) < 0)
+    {
+        WARN("Failed to initialise shader parser.\n");
+        return ret;
+    }
+
+    ret = scan_with_parser(compile_info, message_context, parser);
     vkd3d_shader_parser_destroy(parser);
+
+    return ret;
+}
+
+static int scan_d3dbc(const struct vkd3d_shader_compile_info *compile_info,
+        struct vkd3d_shader_message_context *message_context)
+{
+    struct vkd3d_shader_parser *parser;
+    int ret;
+
+    if ((ret = vkd3d_shader_sm1_parser_create(compile_info, message_context, &parser)) < 0)
+    {
+        WARN("Failed to initialise shader parser.\n");
+        return ret;
+    }
+
+    ret = scan_with_parser(compile_info, message_context, parser);
+    vkd3d_shader_parser_destroy(parser);
+
     return ret;
 }
 
@@ -1012,6 +1040,10 @@ int vkd3d_shader_scan(const struct vkd3d_shader_compile_info *compile_info, char
             ret = VKD3D_ERROR_NOT_IMPLEMENTED;
             break;
 
+        case VKD3D_SHADER_SOURCE_D3D_BYTECODE:
+            ret = scan_d3dbc(compile_info, &message_context);
+            break;
+
         default:
             ERR("Unsupported source type %#x.\n", compile_info->source_type);
             ret = VKD3D_ERROR_INVALID_ARGUMENT;
@@ -1045,6 +1077,7 @@ static int compile_dxbc_tpf(const struct vkd3d_shader_compile_info *compile_info
 
     if ((ret = vkd3d_shader_sm4_parser_create(compile_info, message_context, &parser)) < 0)
     {
+        WARN("Failed to initialise shader parser.\n");
         vkd3d_shader_free_scan_descriptor_info(&scan_descriptor_info);
         return ret;
     }
diff --git a/tests/vkd3d_shader_api.c b/tests/vkd3d_shader_api.c
index c9045b81..6fb855c2 100644
--- a/tests/vkd3d_shader_api.c
+++ b/tests/vkd3d_shader_api.c
@@ -274,6 +274,9 @@ static void test_d3dbc(void)
             (int)d3d_asm.size, (char *)d3d_asm.code);
     vkd3d_shader_free_shader_code(&d3d_asm);
 
+    rc = vkd3d_shader_scan(&info, NULL);
+    ok(rc == VKD3D_OK, "Got unexpected error code %d.\n", rc);
+
     info.source.size = sizeof(vs_minimal) + 1;
     rc = vkd3d_shader_compile(&info, &d3d_asm, NULL);
     ok(rc == VKD3D_OK, "Got unexpected error code %d.\n", rc);