diff --git a/t/t.h b/t/t.h
index 3fc6f07..51c3452 100644
--- a/t/t.h
+++ b/t/t.h
@@ -83,7 +83,7 @@ void t_fcloseall(void);
  * Various utilities
  */
 int t_compare_mem(const void *, const void *, size_t);
-int t_compare_str(const char *, const char *, size_t);
+int t_compare_str(const char *, const char *);
 
 /*
  * Useful constants
diff --git a/t/t_util.c b/t/t_util.c
index 7a1a9a3..5129cd6 100644
--- a/t/t_util.c
+++ b/t/t_util.c
@@ -70,7 +70,7 @@ int
 t_compare_str(const char *expected, const char *received)
 {
 
-	if (strcmp(expected, received, len) != 0) {
+	if (strcmp(expected, received) != 0) {
 		t_verbose("expected %s\n", expected);
 		t_verbose("received %s\n", received);
 		return (0);