1 files changed, 1 insertions, 1 deletions

diff --git a/sway/commands/input/calibration_matrix.c b/sway/commands/input/calibration_matrix.c
index ac15d152..9ac2bd7f 100644
--- a/sway/commands/input/calibration_matrix.c
+++ b/sway/commands/input/calibration_matrix.c
@@ -27,7 +27,7 @@ struct cmd_results *input_cmd_calibration_matrix(int argc, char **argv) {
         for (int i = 0; i < split->length; ++i) {
                 char *item = split->items[i];
                 float x = parse_float(item);
-                if (x != x) {
+                if (isnan(x)) {
                         return cmd_results_new(CMD_FAILURE, "calibration_matrix: unable to parse float: %s", item);
                 }
                 parsed[i] = x;