diff --git a/src/3rdparty/Leksys/iniparser.hpp b/src/3rdparty/Leksys/iniparser.hpp
index da9b4060e98dfc3e1223b8538737ad89df15fee5..1bfbce5d11f5bbf1a6780663216c3341664e671b 100644
--- a/src/3rdparty/Leksys/iniparser.hpp
+++ b/src/3rdparty/Leksys/iniparser.hpp
@@ -186,13 +186,13 @@ namespace INI
 
     // Trim string from start
     static inline std::string &ltrim(std::string &s) {
-        s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::ptr_fun<int, int>(__in_isspace))));
+        s.erase(s.begin(), std::find_if(s.begin(), s.end(), [] (int ch) { return ! __in_isspace(ch); }));
         return s;
     }
 
     // Trim string from end
     static inline std::string &rtrim(std::string &s) {
-        s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::ptr_fun<int, int>(__in_isspace))).base(), s.end());
+        s.erase(std::find_if(s.rbegin(), s.rend(), [] (int ch) { return ! __in_isspace(ch); }).base(), s.end());
         return s;
     }