conffile.cpp | 2 +-

 conffile.h   | 4 ++--

 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/conffile.cpp b/conffile.cpp

index 817afae..5e121e2 100644

--- a/conffile.cpp

+++ b/conffile.cpp

@@ -452,7 +452,7 @@ void ConfigFile::ClearLines()

     }

 }

-bool ConfigFile::ConfigEntry::section_then_key_less::operator()(const ConfigEntry &a, const ConfigEntry &b) {

+bool ConfigFile::ConfigEntry::section_then_key_less::operator()(const ConfigEntry &a, const ConfigEntry &b) const {

 	if(curConfigFile && a.section!=b.section){

 		const int sva = curConfigFile->GetSectionSize(a.section);

 		const int svb = curConfigFile->GetSectionSize(b.section);

diff --git a/conffile.h b/conffile.h

index ba69812..6b45d70 100644

--- a/conffile.h

+++ b/conffile.h

@@ -90,7 +90,7 @@ class ConfigFile {

 		mutable bool used;

         struct section_then_key_less {

-            bool operator()(const ConfigEntry &a, const ConfigEntry &b);

+            bool operator()(const ConfigEntry &a, const ConfigEntry &b) const;

         };

         struct key_less {

@@ -101,7 +101,7 @@ class ConfigFile {

         };

         struct line_less {

-            bool operator()(const ConfigEntry &a, const ConfigEntry &b){

+            bool operator()(const ConfigEntry &a, const ConfigEntry &b) const{

 				if(a.line==b.line) return (b.val.empty() && !a.val.empty()) || a.key<b.key;

                 if(b.line<0) return true;

                 if(a.line<0) return false;