diff --git a/socket.c b/socket.c
index acbc2c4..466727f 100644
--- a/socket.c
+++ b/socket.c
@@ -1336,7 +1336,7 @@ SCK_Receive(int sock_fd, void *buffer, unsigned int length, int flags)
 /* ================================================== */
 
 int
-SCK_Send(int sock_fd, void *buffer, unsigned int length, int flags)
+SCK_Send(int sock_fd, const void *buffer, unsigned int length, int flags)
 {
   int r;
 
diff --git a/socket.h b/socket.h
index 9d4a38e..823dfb6 100644
--- a/socket.h
+++ b/socket.h
@@ -114,7 +114,7 @@ extern int SCK_ShutdownConnection(int sock_fd);
 
 /* Receive and send data on connected sockets - recv()/send() wrappers */
 extern int SCK_Receive(int sock_fd, void *buffer, unsigned int length, int flags);
-extern int SCK_Send(int sock_fd, void *buffer, unsigned int length, int flags);
+extern int SCK_Send(int sock_fd, const void *buffer, unsigned int length, int flags);
 
 /* Receive a single message or multiple messages.  The functions return the
    number of received messages, or 0 on error.  The returned data point to