diff --git a/tools/utils/blender_theme_as_c.py b/tools/utils/blender_theme_as_c.py
index a071e185375..4503c1cc1fc 100755
--- a/tools/utils/blender_theme_as_c.py
+++ b/tools/utils/blender_theme_as_c.py
@@ -37,13 +37,9 @@ C_SOURCE_HEADER = r'''/* SPDX-FileCopyrightText: 2018 Blender Authors
 
 /* clang-format off */
 
-#ifdef __LITTLE_ENDIAN__
-#  define RGBA(c) {((c) >> 24) & 0xff, ((c) >> 16) & 0xff, ((c) >> 8) & 0xff, (c) & 0xff}
-#  define RGB(c)  {((c) >> 16) & 0xff, ((c) >> 8) & 0xff, (c) & 0xff}
-#else
-#  define RGBA(c) {(c) & 0xff, ((c) >> 8) & 0xff, ((c) >> 16) & 0xff, ((c) >> 24) & 0xff}
-#  define RGB(c)  {(c) & 0xff, ((c) >> 8) & 0xff, ((c) >> 16) & 0xff}
-#endif
+/* NOTE: this is endianness-sensitive. */
+#define RGBA(c) {((c) >> 24) & 0xff, ((c) >> 16) & 0xff, ((c) >> 8) & 0xff, (c) & 0xff}
+#define RGB(c)  {((c) >> 16) & 0xff, ((c) >> 8) & 0xff, (c) & 0xff}
 
 '''