1 files changed, 1 insertions, 1 deletions

diff --git a/sway/commands/assign.c b/sway/commands/assign.c
index 976bc3cc..f7d911f7 100644
--- a/sway/commands/assign.c
+++ b/sway/commands/assign.c
@@ -17,7 +17,7 @@ struct cmd_results *cmd_assign(int argc, char **argv) {
         char *err_str = NULL;
         struct criteria *criteria = criteria_parse(argv[0], &err_str);
         if (!criteria) {
-                error = cmd_results_new(CMD_INVALID, err_str);
+                error = cmd_results_new(CMD_INVALID, "%s", err_str);
                 free(err_str);
                 return error;
         }