diff --git a/includes/easysock.hpp b/includes/easysock.hpp
index 68563d4..fed9e0e 100644
--- a/includes/easysock.hpp
+++ b/includes/easysock.hpp
@@ -55,7 +55,7 @@ int create_remote (int network,char transport,char* address,int port,struct sock
 /* check_ip_ver - This function checks if the given string is an IPv4 address (returns 4), 
 IPv6 address (returns 6) or neither (returns -1). */
 
-int check_ip_ver(char* address);
+int check_ip_ver(const char* address);
 
 /* int_to_inet - Takes an int value (4 for IPv4, 6 for IPv6) and returns AF_INET or
 AF_INET6 respectively. */