diff --git a/src/options.c b/src/options.c
index 31729d08d..526244e93 100644
--- a/src/options.c
+++ b/src/options.c
@@ -95,7 +95,7 @@ static struct allopt_t allopt[SIZE(allopt_init)];
 /* use rest of file */
 
 extern char configfile[]; /* for messages */
-extern struct symparse loadsyms[];
+extern const struct symparse loadsyms[];
 #if defined(TOS) && defined(TEXTCOLOR)
 extern boolean colors_changed;  /* in tos.c */
 #endif
diff --git a/sys/share/pmatchregex.c b/sys/share/pmatchregex.c
index 0cf477a8c..95dc4de11 100644
--- a/sys/share/pmatchregex.c
+++ b/sys/share/pmatchregex.c
@@ -41,7 +41,7 @@ regex_compile(const char *s, struct nhregex *re)
     return TRUE;
 }
 
-const char *
+char *
 regex_error_desc(struct nhregex *re UNUSED, char *errbuf)
 {
     return strcpy(errbuf, "pattern match compilation error");