diff --git a/cmd-string.c b/cmd-string.c
index dbd431b1..e05e2799 100644
--- a/cmd-string.c
+++ b/cmd-string.c
@@ -1,4 +1,4 @@
-/* $Id: cmd-string.c,v 1.14 2009-05-04 19:12:37 nicm Exp $ */
+/* $Id: cmd-string.c,v 1.15 2009-05-15 12:58:56 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -63,7 +63,7 @@ cmd_string_parse(const char *s, struct cmd_list **cmdlist, char **cause)
 	if ((t = strchr(s, ' ')) == NULL && (t = strchr(s, '\t')) == NULL)
 		t = strchr(s, '\0');
 	if ((u = strchr(s, '=')) != NULL && u < t) {
-		if (putenv(s) != 0) {
+		if (putenv((char *) s) != 0) {
 			xasprintf(cause, "assignment failed: %s", s);
 			return (-1);
 		}
diff --git a/window.c b/window.c
index 73712f4b..787700a4 100644
--- a/window.c
+++ b/window.c
@@ -1,4 +1,4 @@
-/* $Id: window.c,v 1.75 2009-05-14 07:58:38 nicm Exp $ */
+/* $Id: window.c,v 1.76 2009-05-15 12:58:56 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -590,7 +590,7 @@ window_pane_spawn(struct window_pane *wp,
 		if (chdir(wp->cwd) != 0)
 			chdir("/");
 		for (envq = envp; *envq != NULL; envq++) {
-			if (putenv(*envq) != 0)
+			if (putenv((char *) *envq) != 0)
 				fatal("putenv failed");
 		}
 		sigreset();