diff --git a/src/json.hpp b/src/json.hpp
index 8e2cfed0..daa4e21b 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -994,7 +994,6 @@ class basic_json
     using basic_json_t = basic_json<ObjectType, ArrayType, StringType,
           BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType,
           AllocatorType, JSONSerializer>;
-    class primitive_iterator_t;
 
   public:
     using value_t = ::nlohmann::value_t;
diff --git a/src/json.hpp.re2c b/src/json.hpp.re2c
index 4fcdb23f..924a4ca1 100644
--- a/src/json.hpp.re2c
+++ b/src/json.hpp.re2c
@@ -994,7 +994,6 @@ class basic_json
     using basic_json_t = basic_json<ObjectType, ArrayType, StringType,
           BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType,
           AllocatorType, JSONSerializer>;
-    class primitive_iterator_t;
 
   public:
     using value_t = ::nlohmann::value_t;