diff --git a/gsw_check_functions.c b/gsw_check_functions.c
index 1b911be..83b63e8 100644
--- a/gsw_check_functions.c
+++ b/gsw_check_functions.c
@@ -111,7 +111,7 @@ int assert_equal(int actual, int expected, const char *test_name) {
 void test_infunnel() {
     // Inside the funnel.
     int result1 = gsw_infunnel(35.0, 5.0, 400);
-    assert_equal(result1, 0, "gsw_infunnel -> inside funnel");
+    assert_equal(result1, 1, "gsw_infunnel -> inside funnel");
 
     int result2 = gsw_infunnel(20.0, 7.0, 2000);
     assert_equal(result2, 1, "gsw_infunnel -> inside funnel");