diff --git a/src/library/string.cpp b/src/library/string.cpp
index 8f168b68..d35563e8 100644
--- a/src/library/string.cpp
+++ b/src/library/string.cpp
@@ -9,16 +9,15 @@ std::string strip_CR(const std::string& str)
 
 void istrip_CR(std::string& str)
 {
-	std::string x = str;
 	size_t crc = 0;
-	size_t xl = x.length();
+	size_t xl = str.length();
 	while(crc < xl) {
-		char y = x[xl - crc - 1];
+		char y = str[xl - crc - 1];
 		if(y != '\r' && y != '\n')
 			break;
 		crc++;
 	}
-	x.substr(0, xl - crc);
+	str = str.substr(0, xl - crc);
 }
 
 int firstchar(const std::string& str)