diff --git a/tests/clar/clar/print.h b/tests/clar/clar/print.h
index 6a2321b39..59b7dc14a 100644
--- a/tests/clar/clar/print.h
+++ b/tests/clar/clar/print.h
@@ -127,7 +127,7 @@ static void clar_print_tap_error(int num, const struct clar_report *report, cons
 
 static void print_escaped(const char *str)
 {
-	char *c;
+	const char *c;
 
 	while ((c = strchr(str, '\'')) != NULL) {
 		printf("%.*s", (int)(c - str), str);