diff --git a/test_regress/t/t_flag_ldflags.pl b/test_regress/t/t_flag_ldflags.pl
index 8f5aa89582..33d73877b1 100755
--- a/test_regress/t/t_flag_ldflags.pl
+++ b/test_regress/t/t_flag_ldflags.pl
@@ -45,7 +45,7 @@
 
 execute(
     check_finished => 1,
-    run_env => "LD_LIBRARY_PATH=$Self->{obj_dir}",
+    run_env => "LD_LIBRARY_PATH=$Self->{obj_dir}:$ENV{LD_LIBRARY_PATH}",
     );
 
 ok(1);