diff --git a/src/json.hpp b/src/json.hpp
index ad4c65f69..1a81a3e45 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -7374,7 +7374,7 @@ basic_json_parser_64:
 
         @return the floating point number
         */
-        long double str_to_float_t(long double* type, char** endptr) const
+        long double str_to_float_t(long double* /* type */, char** endptr) const
         {
             return std::strtold(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
         }
@@ -7393,7 +7393,7 @@ basic_json_parser_64:
 
         @return the floating point number
         */
-        double str_to_float_t(double* type, char** endptr) const
+        double str_to_float_t(double* /* type */, char** endptr) const
         {
             return std::strtod(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
         }
@@ -7412,7 +7412,7 @@ basic_json_parser_64:
 
         @return the floating point number
         */
-        float str_to_float_t(float* type, char** endptr) const
+        float str_to_float_t(float* /* type */, char** endptr) const
         {
             return std::strtof(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
         }
diff --git a/src/json.hpp.re2c b/src/json.hpp.re2c
index 28f7d498d..243e9d360 100644
--- a/src/json.hpp.re2c
+++ b/src/json.hpp.re2c
@@ -7056,7 +7056,7 @@ class basic_json
 
         @return the floating point number
         */
-        long double str_to_float_t(long double* type, char** endptr) const
+        long double str_to_float_t(long double* /* type */, char** endptr) const
         {
             return std::strtold(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
         }
@@ -7075,7 +7075,7 @@ class basic_json
 
         @return the floating point number
         */
-        double str_to_float_t(double* type, char** endptr) const
+        double str_to_float_t(double* /* type */, char** endptr) const
         {
             return std::strtod(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
         }
@@ -7094,7 +7094,7 @@ class basic_json
 
         @return the floating point number
         */
-        float str_to_float_t(float* type, char** endptr) const
+        float str_to_float_t(float* /* type */, char** endptr) const
         {
             return std::strtof(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
         }