diff --git a/include/papilio/core.hpp b/include/papilio/core.hpp
index feb25e5..ba18818 100755
--- a/include/papilio/core.hpp
+++ b/include/papilio/core.hpp
@@ -3811,6 +3811,9 @@ class int_formatter : public std_formatter_base
 
             case 2:
                 context_t::append(ctx, uppercase ? 'B' : 'b');
+
+            default:
+                break;
             }
         }