diff --git a/include/nlohmann/detail/output/serializer.hpp b/include/nlohmann/detail/output/serializer.hpp
index 2ced730d2..76bfa7a1c 100644
--- a/include/nlohmann/detail/output/serializer.hpp
+++ b/include/nlohmann/detail/output/serializer.hpp
@@ -575,8 +575,9 @@ class serializer
                             break;
                         }
 
-                        default:            // LCOV_EXCL_LINE
-                            JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
+                        case error_handler_t::keep: // LCOV_EXCL_LINE
+                        default:                    // LCOV_EXCL_LINE
+                            JSON_ASSERT(false);     // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
                     }
                     break;
                 }
@@ -636,8 +637,9 @@ class serializer
                     break;
                 }
 
-                default:            // LCOV_EXCL_LINE
-                    JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
+                case error_handler_t::keep: // LCOV_EXCL_LINE
+                default:                    // LCOV_EXCL_LINE
+                    JSON_ASSERT(false);     // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
             }
         }
     }
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index c37bb6bdf..53d6b0000 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -19137,8 +19137,9 @@ class serializer
                             break;
                         }
 
-                        default:            // LCOV_EXCL_LINE
-                            JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
+                        case error_handler_t::keep: // LCOV_EXCL_LINE
+                        default:                    // LCOV_EXCL_LINE
+                            JSON_ASSERT(false);     // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
                     }
                     break;
                 }
@@ -19198,8 +19199,9 @@ class serializer
                     break;
                 }
 
-                default:            // LCOV_EXCL_LINE
-                    JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
+                case error_handler_t::keep: // LCOV_EXCL_LINE
+                default:                    // LCOV_EXCL_LINE
+                    JSON_ASSERT(false);     // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
             }
         }
     }