diff --git a/CMakeLists.txt b/CMakeLists.txt
index d65b94d27..f942e04ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,6 @@ endif()
 option(JSON_BuildTests                     "Build the unit tests when BUILD_TESTING is enabled." ${JSON_BuildTests_INIT})
 option(JSON_CI                             "Enable CI build targets." OFF)
 option(JSON_Diagnostics                    "Use extended diagnostic messages." OFF)
-option(JSON_DisableEnumSerialization       "Disable default integer enum serialization." OFF)
 option(JSON_GlobalUDLs                     "Place use-defined string literals in the global namespace." ON)
 option(JSON_ImplicitConversions            "Enable implicit conversions." ON)
 option(JSON_DisableEnumSerialization       "Disable default integer enum serialization." OFF)