diff --git a/include/sway/commands.h b/include/sway/commands.h
index 123a7245..fc6ce22e 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -9,7 +9,7 @@ struct sway_container;
 typedef struct cmd_results *sway_cmd(int argc, char **argv);
 
 struct cmd_handler {
-	char *command;
+	const char *command;
 	sway_cmd *handle;
 };
 
@@ -46,7 +46,7 @@ enum expected_args {
 struct cmd_results *checkarg(int argc, const char *name,
 		enum expected_args type, int val);
 
-const struct cmd_handler *find_handler(char *line,
+const struct cmd_handler *find_handler(const char *line,
 		const struct cmd_handler *cmd_handlers, size_t handlers_size);
 
 /**
diff --git a/sway/commands.c b/sway/commands.c
index 041da7ea..28e9d8d2 100644
--- a/sway/commands.c
+++ b/sway/commands.c
@@ -148,7 +148,7 @@ static int handler_compare(const void *_a, const void *_b) {
 	return strcasecmp(a->command, b->command);
 }
 
-const struct cmd_handler *find_handler(char *line,
+const struct cmd_handler *find_handler(const char *line,
 		const struct cmd_handler *handlers, size_t handlers_size) {
 	if (!handlers || !handlers_size) {
 		return NULL;