diff --git a/src/test-gradient-method.cc b/src/test-gradient-method.cc
index c54e64ab90fde15bed46fad6bfbc5889fbaf5c8f..f3f6c4c774ca0ec7e9c4f7ac51cdc78c537de80d 100644
--- a/src/test-gradient-method.cc
+++ b/src/test-gradient-method.cc
@@ -474,7 +474,7 @@ void testSteepFunction() {
   start[1] = 0;
 
   double const ret3 = functionTester(J, start, 1);
-  assert(std::abs(ret1 - ret3) < 1e-5);
+  assert(std::abs(ret2 - ret3) < 1e-5);
 }
 
 int main() {