diff --git a/c-programming/io/freadln.c b/c-programming/io/freadln.c
index 82e20b0..647cabc 100644
--- a/c-programming/io/freadln.c
+++ b/c-programming/io/freadln.c
@@ -135,12 +135,13 @@ int main(void) {
 	// stdin test
 	printf("Type something> ");
 	char* line;
-	if (finreadln(&line, NULL) == freadln_ERROR) {
+	size_t line_length = 0;
+	if (finreadln(&line, &line_length) == freadln_ERROR) {
 		perror("freadln");
 		return EXIT_FAILURE;
 	}
 	printf("Input string: '%s' (%" PRIuSIZE " characters)\n", line,
-	       (SIZE_T_FORMAT) strlen(line));
+	       (SIZE_T_FORMAT) line_length);
 
 	// file test
 #define TEST_FILE "freadln_test.txt"