diff --git a/modus-operandi-theme.el b/modus-operandi-theme.el
index bcde386..6274088 100644
--- a/modus-operandi-theme.el
+++ b/modus-operandi-theme.el
@@ -50,7 +50,10 @@
 
 
 
-(require 'modus-themes)
+(eval-and-compile
+  (unless (and (fboundp 'require-theme)
+               (require-theme 'modus-themes t))
+    (require 'modus-themes)))
 
 (deftheme modus-operandi
   "Accessible and customizable light theme (WCAG AAA standard).
diff --git a/modus-vivendi-theme.el b/modus-vivendi-theme.el
index d290929..347e6d2 100644
--- a/modus-vivendi-theme.el
+++ b/modus-vivendi-theme.el
@@ -50,7 +50,10 @@
 
 
 
-(require 'modus-themes)
+(eval-and-compile
+  (unless (and (fboundp 'require-theme)
+               (require-theme 'modus-themes t))
+    (require 'modus-themes)))
 
 (deftheme modus-vivendi
   "Accessible and customizable dark theme (WCAG AAA standard).