diff --git a/core/sessionparser.cpp b/core/sessionparser.cpp
index 3413311..47bb977 100755
--- a/core/sessionparser.cpp
+++ b/core/sessionparser.cpp
@@ -134,15 +134,25 @@ void SessionParser::SkipLine()
 long SessionParser::ReadLong()
 {
 long res = 0;
+bool is_sign = false;
 
 	SkipWhite();
 
+	if( last == '-' )
+	{
+		is_sign = true;
+		last = file.get();
+	}
+
 	while( IsDigit(last) )
 	{
 		res  = res*10 + (last-'0');
 		last = file.get();
 	}
 
+	if( is_sign )
+		res = -res;
+
 return res;
 }