diff --git a/autotest/cpp/test_gdal_algorithm.cpp b/autotest/cpp/test_gdal_algorithm.cpp
index 21fa0f5a963d..6174c5826c85 100644
--- a/autotest/cpp/test_gdal_algorithm.cpp
+++ b/autotest/cpp/test_gdal_algorithm.cpp
@@ -501,7 +501,7 @@ TEST_F(test_gdal_algorithm, wrong_long_name_dash)
     };
 
     MyAlgorithm alg;
-    alg.Run();
+    CPL_IGNORE_RET_VAL(alg.Run());
 }
 
 TEST_F(test_gdal_algorithm, wrong_long_name_contains_equal)