diff --git a/plugins/sudoers/set_perms.c b/plugins/sudoers/set_perms.c
index 84215fb09..f3166155b 100644
--- a/plugins/sudoers/set_perms.c
+++ b/plugins/sudoers/set_perms.c
@@ -98,7 +98,7 @@ rewind_perms(void)
 int
 set_perms(int perm)
 {
-    struct perm_state *state, *ostate;
+    struct perm_state *state, *ostate = NULL;
     const char *errstr;
     int noexit;
 
@@ -304,19 +304,22 @@ restore_perms(void)
     /* XXX - more cases here where euid != ruid */
     if (OID(euid) == ROOT_UID && state->euid != ROOT_UID) {
 	if (setresuid(-1, ROOT_UID, -1)) {
-	    warning("setresuid() [%d, %d, %d] -> [%d, %d, %d]", state->ruid,
-		state->euid, state->suid, -1, ROOT_UID, -1);
+	    warning("setresuid() [%d, %d, %d] -> [%d, %d, %d]",
+		(int)state->ruid, (int)state->euid, (int)state->suid,
+		-1, ROOT_UID, -1);
 	    goto bad;
 	}
     }
     if (setresuid(OID(ruid), OID(euid), OID(suid))) {
-	warning("setresuid() [%d, %d, %d] -> [%d, %d, %d]", state->ruid,
-	    state->euid, state->suid, OID(ruid), OID(euid), OID(suid));
+	warning("setresuid() [%d, %d, %d] -> [%d, %d, %d]",
+	    (int)state->ruid, (int)state->euid, (int)state->suid,
+	    (int)OID(ruid), (int)OID(euid), (int)OID(suid));
 	goto bad;
     }
     if (setresgid(OID(rgid), OID(egid), OID(sgid))) {
-	warning("setresgid() [%d, %d, %d] -> [%d, %d, %d]", state->rgid,
-	    state->egid, state->sgid, OID(rgid), OID(egid), OID(sgid));
+	warning("setresgid() [%d, %d, %d] -> [%d, %d, %d]",
+	    (int)state->rgid, (int)state->egid, (int)state->sgid,
+	    (int)OID(rgid), (int)OID(egid), (int)OID(sgid));
 	goto bad;
     }
     if (state->grlist != ostate->grlist) {
@@ -344,7 +347,7 @@ bad:
 int
 set_perms(int perm)
 {
-    struct perm_state *state, *ostate;
+    struct perm_state *state, *ostate = NULL;
     const char *errstr;
     int noexit;
 
@@ -542,13 +545,13 @@ restore_perms(void)
 	}
     }
     if (setreuid(OID(ruid), OID(euid))) {
-	warning("setreuid() [%d, %d] -> [%d, %d]", state->ruid,
-	    state->euid, OID(ruid), OID(euid));
+	warning("setreuid() [%d, %d] -> [%d, %d]", (int)state->ruid,
+	    (int)state->euid, (int)OID(ruid), (int)OID(euid));
 	goto bad;
     }
     if (setregid(OID(rgid), OID(egid))) {
-	warning("setregid() [%d, %d] -> [%d, %d]", state->rgid,
-	    state->egid, OID(rgid), OID(egid));
+	warning("setregid() [%d, %d] -> [%d, %d]", (int)state->rgid,
+	    (int)state->egid, (int)OID(rgid), (int)OID(egid));
 	goto bad;
     }
     if (state->grlist != ostate->grlist) {
@@ -576,7 +579,7 @@ bad:
 int
 set_perms(int perm)
 {
-    struct perm_state *state, *ostate;
+    struct perm_state *state, *ostate = NULL;
     const char *errstr;
     int noexit;
 
@@ -780,7 +783,7 @@ restore_perms(void)
     }
 
     if (setegid(OID(egid))) {
-	warning("setegid(%d)", OID(egid));
+	warning("setegid(%d)", (int)OID(egid));
 	goto bad;
     }
     if (state->grlist != ostate->grlist) {
@@ -790,7 +793,7 @@ restore_perms(void)
 	}
     }
     if (seteuid(OID(euid))) {
-	warning("seteuid(%d)", OID(euid));
+	warning("seteuid(%d)", (int)OID(euid));
 	goto bad;
     }
     grlist_delref(state->grlist);
@@ -810,7 +813,7 @@ bad:
 int
 set_perms(int perm)
 {
-    struct perm_state *state, *ostate;
+    struct perm_state *state, *ostate = NULL;
     const char *errstr;
     int noexit;
 
@@ -906,7 +909,7 @@ restore_perms(void)
     perm_stack_depth--;
 
     if (OID(rgid) != -1 && setgid(ostate->rgid)) {
-	warning("setgid(%d)", ostate->rgid);
+	warning("setgid(%d)", (int)ostate->rgid);
 	goto bad;
     }
     if (state->grlist != ostate->grlist) {
@@ -917,7 +920,7 @@ restore_perms(void)
     }
     grlist_delref(state->grlist);
     if (OID(ruid) != -1 && setuid(ostate->ruid)) {
-	warning("setuid(%d)", ostate->ruid);
+	warning("setuid(%d)", (int)ostate->ruid);
 	goto bad;
     }
     return;
diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
index 43119e233..8ebe4250f 100644
--- a/plugins/sudoers/visudo.c
+++ b/plugins/sudoers/visudo.c
@@ -499,16 +499,16 @@ install_sudoers(struct sudoersfile *sp, int oldperms)
 #endif
 	    error(1, _("unable to stat %s"), sp->path);
 	if (chown(sp->tpath, sb.st_uid, sb.st_gid) != 0) {
-	    warning(_("unable to set (uid, gid) of %s to (%d, %d)"),
-		sp->tpath, sb.st_uid, sb.st_gid);
+	    warning(_("unable to set (uid, gid) of %s to (%u, %u)"),
+		sp->tpath, (unsigned int)sb.st_uid, (unsigned int)sb.st_gid);
 	}
 	if (chmod(sp->tpath, sb.st_mode & 0777) != 0) {
 	    warning(_("unable to change mode of %s to 0%o"), sp->tpath,
-		(sb.st_mode & 0777));
+		(unsigned int)(sb.st_mode & 0777));
 	}
     } else {
 	if (chown(sp->tpath, SUDOERS_UID, SUDOERS_GID) != 0) {
-	    warning(_("unable to set (uid, gid) of %s to (%d, %d)"),
+	    warning(_("unable to set (uid, gid) of %s to (%u, %u)"),
 		sp->tpath, SUDOERS_UID, SUDOERS_GID);
 	    return FALSE;
 	}
@@ -734,7 +734,7 @@ check_syntax(char *sudoers_path, int quiet, int strict)
 	    error = TRUE;
 	    if (!quiet) {
 		fprintf(stderr,
-		    _("%s: wrong owner (uid, gid) should be (%d, %d)\n"),
+		    _("%s: wrong owner (uid, gid) should be (%u, %u)\n"),
 		    sudoers_path, SUDOERS_UID, SUDOERS_GID);
 		}
 	}
diff --git a/src/exec.c b/src/exec.c
index 52dbdbb1d..fab19803e 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -451,8 +451,10 @@ handle_signals(int fd, pid_t child, int log_io, struct command_status *cstat)
 			int fd = open(_PATH_TTY, O_RDWR|O_NOCTTY, 0);
 			if (fd != -1)
 			    saved_pgrp = tcgetpgrp(fd);
-			if (kill(getpid(), WSTOPSIG(status)) != 0)
-			    warning("kill(%d, %d)", getpid(), WSTOPSIG(status));
+			if (kill(getpid(), WSTOPSIG(status)) != 0) {
+			    warning("kill(%d, %d)", (int)getpid(),
+				WSTOPSIG(status));
+			}
 			if (fd != -1) {
 			    if (saved_pgrp != (pid_t)-1)
 				(void)tcsetpgrp(fd, saved_pgrp);
@@ -476,7 +478,7 @@ handle_signals(int fd, pid_t child, int log_io, struct command_status *cstat)
 		if (signo == SIGALRM)
 		    terminate_child(child, FALSE);
 		else if (kill(child, signo) != 0)
-		    warning("kill(%d, %d)", child, signo);
+		    warning("kill(%d, %d)", (int)child, signo);
 	    }
 	}
     }
diff --git a/src/exec_pty.c b/src/exec_pty.c
index b24d691b6..60ed7efc9 100644
--- a/src/exec_pty.c
+++ b/src/exec_pty.c
@@ -323,7 +323,7 @@ suspend_parent(int signo)
 	sigaction(signo, &sa, &osa);
 	sudo_debug(8, "kill parent %d", signo);
 	if (killpg(ppgrp, signo) != 0)
-	    warning("killpg(%d, %d)", ppgrp, signo);
+	    warning("killpg(%d, %d)", (int)ppgrp, signo);
 
 	/* Check foreground/background status on resume. */
 	check_foreground();
diff --git a/src/sudo.c b/src/sudo.c
index 658d23eea..40cfc2f4c 100644
--- a/src/sudo.c
+++ b/src/sudo.c
@@ -956,12 +956,14 @@ exec_setup(struct command_details *details, const char *ptyname, int ptyfd)
      */
 #ifdef HAVE_SETEUID
     if (ISSET(details->flags, CD_SET_EGID) && setegid(details->egid)) {
-	warning(_("unable to set effective gid to runas gid %u"), details->egid);
+	warning(_("unable to set effective gid to runas gid %u"),
+	    (unsigned int)details->egid);
 	goto done;
     }
 #endif
     if (ISSET(details->flags, CD_SET_GID) && setgid(details->gid)) {
-	warning(_("unable to set gid to runas gid %u"), details->gid);
+	warning(_("unable to set gid to runas gid %u"),
+	    (unsigned int)details->gid);
 	goto done;
     }
 
@@ -1000,8 +1002,8 @@ exec_setup(struct command_details *details, const char *ptyname, int ptyfd)
     }
 #elif HAVE_SETREUID
     if (setreuid(details->uid, details->euid) != 0) {
-	warning(_("unable to change to runas uid (%u, %u)"), details->uid,
-	    details->euid);
+	warning(_("unable to change to runas uid (%u, %u)"),
+	    (unsigned int)details->uid, (unsigned int)details->euid);
 	goto done;
     }
 #else