diff --git a/render.c b/render.c
index 5d2f4263..57af555c 100644
--- a/render.c
+++ b/render.c
@@ -1,6 +1,7 @@
 #include "render.h"
 
 #include <string.h>
+#include <wctype.h>
 #include <unistd.h>
 
 #include <sys/ioctl.h>
@@ -2591,6 +2592,9 @@ render_urls(struct terminal *term)
             }
         }
 
+        for (size_t i = 0; i < wcslen(key); i++)
+            label[i] = towupper(label[i]);
+
         size_t len = wcslen(label);
         int cols = wcswidth(label, len);