diff --git a/doc/common/conf.py b/doc/common/conf.py
index 89d15b3..09cf862 100644
--- a/doc/common/conf.py
+++ b/doc/common/conf.py
@@ -145,13 +145,10 @@ add_module_names = False  # Hide module name
 
 # -- Options for HTML output ----------------------------------------------
 
-if ON_RTD:
-    html_theme = "default"
-else:
-    import sphinx_rtd_theme
+import sphinx_rtd_theme
 
-    html_theme = "sphinx_rtd_theme"
-    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+html_theme = "sphinx_rtd_theme"
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 html_context = {
     "disclaimer": _DISCLAIMER,