diff --git a/include/stdexec/__detail/__tuple.hpp b/include/stdexec/__detail/__tuple.hpp
index e51c90b3a..4374c9f45 100644
--- a/include/stdexec/__detail/__tuple.hpp
+++ b/include/stdexec/__detail/__tuple.hpp
@@ -397,7 +397,10 @@ namespace STDEXEC
     {
       return static_cast<_Tuple&&>(__tupl).__val7;
     }
-    STDEXEC_UNREACHABLE();
+    else
+    {
+      STDEXEC_UNREACHABLE();
+    }
   }
 
   //