diff --git a/include/sudo_util.h b/include/sudo_util.h
index 971aad22a9..5fe580b396 100644
--- a/include/sudo_util.h
+++ b/include/sudo_util.h
@@ -262,7 +262,7 @@ sudo_dso_public int sudo_mmap_protect_v1(void *ptr);
 #define sudo_mmap_protect(_a) sudo_mmap_protect_v1(_a)
 
 /* multiarch.c */
-sudo_dso_public char *sudo_stat_multiarch_v1(const char * restrict path, struct stat * restrict sb);
+sudo_dso_public char *sudo_stat_multiarch_v1(const char *path, struct stat *sb);
 #define sudo_stat_multiarch(_a, _b) sudo_stat_multiarch_v1((_a), (_b))
 
 /* parseln.c */
diff --git a/lib/eventlog/logwrap.c b/lib/eventlog/logwrap.c
index 1ade0fb3ac..612379f288 100644
--- a/lib/eventlog/logwrap.c
+++ b/lib/eventlog/logwrap.c
@@ -28,7 +28,7 @@
 #include <sudo_eventlog.h>
 
 size_t
-eventlog_writeln(FILE * restrict fp, char * restrict line, size_t linelen, size_t maxlen)
+eventlog_writeln(FILE *fp, char *line, size_t linelen, size_t maxlen)
 {
     const char *indent = "";
     char *beg = line;
diff --git a/lib/util/multiarch.c b/lib/util/multiarch.c
index 186347aedc..ef847589bf 100644
--- a/lib/util/multiarch.c
+++ b/lib/util/multiarch.c
@@ -39,7 +39,7 @@
  * Returns a dynamically allocated string on success and NULL on failure.
  */
 char *
-sudo_stat_multiarch_v1(const char * restrict path, struct stat * restrict sb)
+sudo_stat_multiarch_v1(const char *path, struct stat *sb)
 {
 #  if defined(__ILP32__)
     const char *libdirs[] = { "/libx32/", "/lib/", "/libexec/", NULL };
@@ -91,7 +91,7 @@ sudo_stat_multiarch_v1(const char * restrict path, struct stat * restrict sb)
 }
 #else
 char *
-sudo_stat_multiarch_v1(const char * restrict path, struct stat * restrict sb)
+sudo_stat_multiarch_v1(const char *path, struct stat *sb)
 {
     return NULL;
 }
diff --git a/lib/util/ttyname_dev.c b/lib/util/ttyname_dev.c
index 23066da345..1ef8eafd01 100644
--- a/lib/util/ttyname_dev.c
+++ b/lib/util/ttyname_dev.c
@@ -216,7 +216,7 @@ sudo_ttyname_scan(const char *dir, dev_t rdev, char *name, size_t namelen)
 }
 
 static char *
-sudo_dev_check(dev_t rdev, const char * restrict devname, char * restrict buf, size_t buflen)
+sudo_dev_check(dev_t rdev, const char *devname, char *buf, size_t buflen)
 {
     struct stat sb;
     debug_decl(sudo_dev_check, SUDO_DEBUG_UTIL);
diff --git a/logsrvd/logsrvd_journal.c b/logsrvd/logsrvd_journal.c
index a0103450cd..62ad6b7b97 100644
--- a/logsrvd/logsrvd_journal.c
+++ b/logsrvd/logsrvd_journal.c
@@ -527,8 +527,8 @@ journal_restart(const RestartMessage *msg, const uint8_t *buf, size_t buflen,
 }
 
 static bool
-journal_write(const uint8_t * restrict buf, size_t len,
-    struct connection_closure * restrict closure)
+journal_write(const uint8_t *buf, size_t len,
+    struct connection_closure *closure)
 {
     uint32_t msg_len;
     debug_decl(journal_write, SUDO_DEBUG_UTIL);
@@ -597,8 +597,8 @@ journal_accept(const AcceptMessage *msg, const uint8_t *buf, size_t len,
  * Store a RejectMessage from the client in the journal.
  */
 static bool
-journal_reject(const RejectMessage *msg, const uint8_t * restrict buf,
-    size_t len, struct connection_closure * restrict closure)
+journal_reject(const RejectMessage *msg, const uint8_t *buf,
+    size_t len, struct connection_closure *closure)
 {
     debug_decl(journal_reject, SUDO_DEBUG_UTIL);
 
@@ -617,8 +617,8 @@ journal_reject(const RejectMessage *msg, const uint8_t * restrict buf,
  * Store an ExitMessage from the client in the journal.
  */
 static bool
-journal_exit(const ExitMessage *msg, const uint8_t * restrict buf, size_t len,
-    struct connection_closure * restrict closure)
+journal_exit(const ExitMessage *msg, const uint8_t *buf, size_t len,
+    struct connection_closure *closure)
 {
     debug_decl(journal_exit, SUDO_DEBUG_UTIL);
 
@@ -635,8 +635,8 @@ journal_exit(const ExitMessage *msg, const uint8_t * restrict buf, size_t len,
  * Store an AlertMessage from the client in the journal.
  */
 static bool
-journal_alert(const AlertMessage *msg, const uint8_t * restrict buf, size_t len,
-    struct connection_closure * restrict closure)
+journal_alert(const AlertMessage *msg, const uint8_t *buf, size_t len,
+    struct connection_closure *closure)
 {
     debug_decl(journal_alert, SUDO_DEBUG_UTIL);
 
@@ -655,8 +655,8 @@ journal_alert(const AlertMessage *msg, const uint8_t * restrict buf, size_t len,
  * Store an IoBuffer from the client in the journal.
  */
 static bool
-journal_iobuf(int iofd, const IoBuffer *iobuf, const uint8_t * restrict buf,
-    size_t len, struct connection_closure * restrict closure)
+journal_iobuf(int iofd, const IoBuffer *iobuf, const uint8_t *buf,
+    size_t len, struct connection_closure *closure)
 {
     debug_decl(journal_iobuf, SUDO_DEBUG_UTIL);
 
@@ -671,8 +671,8 @@ journal_iobuf(int iofd, const IoBuffer *iobuf, const uint8_t * restrict buf,
  * Store a CommandSuspend message from the client in the journal.
  */
 static bool
-journal_suspend(const CommandSuspend *msg, const uint8_t * restrict buf,
-    size_t len, struct connection_closure * restrict closure)
+journal_suspend(const CommandSuspend *msg, const uint8_t *buf,
+    size_t len, struct connection_closure *closure)
 {
     debug_decl(journal_suspend, SUDO_DEBUG_UTIL);
 
@@ -685,8 +685,8 @@ journal_suspend(const CommandSuspend *msg, const uint8_t * restrict buf,
  * Store a ChangeWindowSize message from the client in the journal.
  */
 static bool
-journal_winsize(const ChangeWindowSize *msg, const uint8_t * restrict buf,
-    size_t len, struct connection_closure * restrict closure)
+journal_winsize(const ChangeWindowSize *msg, const uint8_t *buf,
+    size_t len, struct connection_closure *closure)
 {
     debug_decl(journal_winsize, SUDO_DEBUG_UTIL);
 
diff --git a/plugins/audit_json/audit_json.c b/plugins/audit_json/audit_json.c
index 63321a73c0..0adc8b84d8 100644
--- a/plugins/audit_json/audit_json.c
+++ b/plugins/audit_json/audit_json.c
@@ -383,7 +383,7 @@ add_timestamp(struct json_container *jsonc, struct timespec *ts)
 }
 
 static int
-audit_write_json(struct json_container * restrict jsonc)
+audit_write_json(struct json_container *jsonc)
 {
     struct stat sb;
     int ret = -1;
diff --git a/plugins/sudoers/cvtsudoers.c b/plugins/sudoers/cvtsudoers.c
index 689c15137a..3c8d158b29 100644
--- a/plugins/sudoers/cvtsudoers.c
+++ b/plugins/sudoers/cvtsudoers.c
@@ -1079,7 +1079,7 @@ print_aliases_sudoers(struct sudoers_parse_tree *parse_tree,
 static FILE *output_fp;		/* global for convert_sudoers_output */
 
 static int
-convert_sudoers_output(const char * restrict buf)
+convert_sudoers_output(const char *buf)
 {
     return fputs(buf, output_fp);
 }
diff --git a/plugins/sudoers/cvtsudoers_csv.c b/plugins/sudoers/cvtsudoers_csv.c
index bf025280a7..a4455907b1 100644
--- a/plugins/sudoers/cvtsudoers_csv.c
+++ b/plugins/sudoers/cvtsudoers_csv.c
@@ -107,7 +107,7 @@ defaults_to_alias_type(int defaults_type)
  * XXX - rewrite this
  */
 static bool
-print_csv_string(FILE * restrict fp, const char * restrict str, bool quoted)
+print_csv_string(FILE *fp, const char *str, bool quoted)
 {
     const char *src = str;
     char *dst, *newstr;
diff --git a/plugins/sudoers/testsudoers.c b/plugins/sudoers/testsudoers.c
index 13bbb00aa6..bb9e85cbfd 100644
--- a/plugins/sudoers/testsudoers.c
+++ b/plugins/sudoers/testsudoers.c
@@ -65,8 +65,8 @@ enum sudoers_formats {
 static void dump_sudoers(void);
 static void set_runaspw(struct sudoers_context *ctx, const char *);
 static void set_runasgr(struct sudoers_context *ctx, const char *);
-static int testsudoers_error(const char * restrict buf);
-static int testsudoers_output(const char * restrict buf);
+static int testsudoers_error(const char *buf);
+static int testsudoers_output(const char *buf);
 sudo_noreturn static void usage(void);
 static void cb_lookup(const struct sudoers_parse_tree *parse_tree, const struct userspec *us, int user_match, const struct privilege *priv, int host_match, const struct cmndspec *cs, int date_match, int runas_match, int cmnd_match, void *closure);
 static int testsudoers_query(struct sudoers_context *ctx, const struct sudo_nss *nss, struct passwd *pw);
@@ -744,13 +744,13 @@ dump_sudoers(void)
 }
 
 static int
-testsudoers_output(const char * restrict buf)
+testsudoers_output(const char *buf)
 {
     return fputs(buf, stdout);
 }
 
 static int
-testsudoers_error(const char *restrict buf)
+testsudoers_error(const char *buf)
 {
     return fputs(buf, stderr);
 }
diff --git a/src/parse_args.c b/src/parse_args.c
index 65510c02af..baee6cbad5 100644
--- a/src/parse_args.c
+++ b/src/parse_args.c
@@ -756,7 +756,7 @@ usage_excl_ticket(void)
 }
 
 static int
-help_out(const char * restrict buf)
+help_out(const char *buf)
 {
     return fputs(buf, stdout);
 }