diff --git a/libs/vkd3d-shader/preproc.l b/libs/vkd3d-shader/preproc.l
index 388b77f6..c5c49251 100644
--- a/libs/vkd3d-shader/preproc.l
+++ b/libs/vkd3d-shader/preproc.l
@@ -471,6 +471,26 @@ int yylex(YYSTYPE *lval, YYLTYPE *lloc, yyscan_t scanner)
                         }
                         continue;
                     }
+
+                    if (!strcmp(text, "__LINE__"))
+                    {
+                        const struct preproc_file *file = preproc_get_top_file(ctx);
+
+                        /* Not the current line number, but rather the line
+                         * number before invoking any macros. */
+
+                        if (ctx->current_directive)
+                        {
+                            char string[13];
+
+                            sprintf(string, "%d", file->buffer.location.line);
+                            return return_token(T_INTEGER, lval, string);
+                        }
+
+                        if (preproc_is_writing(ctx))
+                            vkd3d_string_buffer_printf(&ctx->buffer, "%d ", file->buffer.location.line);
+                        continue;
+                    }
                 }
 
                 if (ctx->current_directive)
diff --git a/tests/hlsl_d3d12.c b/tests/hlsl_d3d12.c
index 9d8d16d9..03169716 100644
--- a/tests/hlsl_d3d12.c
+++ b/tests/hlsl_d3d12.c
@@ -350,7 +350,7 @@ static void test_preprocess(void)
     for (i = 0; i < ARRAY_SIZE(tests); ++i)
     {
         vkd3d_test_set_context("Source \"%s\"", tests[i].source);
-        todo_if (i == 9 || (i >= 12 && i <= 14))
+        todo_if (i == 9)
             check_preprocess(tests[i].source, NULL, NULL, tests[i].present, tests[i].absent);
     }
     vkd3d_test_set_context(NULL);