diff --git a/include/libssh/priv.h b/include/libssh/priv.h
index e4b5e6cb..7cc2cb26 100644
--- a/include/libssh/priv.h
+++ b/include/libssh/priv.h
@@ -510,7 +510,7 @@ int ssh_send_banner(SSH_SESSION *session, int is_server);
 char *ssh_get_banner(SSH_SESSION *session);
 
 /* errors.c */
-void ssh_set_error(void *error,int code,char *descr,...);
+void ssh_set_error(void *error, int code, const char *descr, ...);
 
 /* in dh.c */
 /* DH key generation */
diff --git a/libssh/error.c b/libssh/error.c
index 36fed437..b44ab402 100644
--- a/libssh/error.c
+++ b/libssh/error.c
@@ -36,7 +36,7 @@
  */
 
 /* ssh_set_error registers an error with a description. the error code is the class of error, and description is obvious.*/
-void ssh_set_error(void *error,int code,char *descr,...){
+void ssh_set_error(void *error, int code, const char *descr, ...) {
     struct error_struct *err= error;
     va_list va;
     va_start(va,descr);