diff --git a/sway/input/input-manager.c b/sway/input/input-manager.c
index 69342c73..f04a8ce0 100644
--- a/sway/input/input-manager.c
+++ b/sway/input/input-manager.c
@@ -70,7 +70,8 @@ char *input_device_get_identifier(struct wlr_input_device *device) {
 
 	char *p = name;
 	for (; *p; ++p) {
-		if (*p == ' ') {
+		// There are in fact input devices with unprintable characters in its name
+		if (*p == ' ' || !isprint(*p)) {
 			*p = '_';
 		}
 	}