diff --git a/test_regress/t/t_vpi_time_cb.cpp b/test_regress/t/t_vpi_time_cb.cpp
index aae0044f6..68af3feb1 100644
--- a/test_regress/t/t_vpi_time_cb.cpp
+++ b/test_regress/t/t_vpi_time_cb.cpp
@@ -215,7 +215,7 @@ int main(int argc, char** argv, char** env) {
 
     // Load and initialize the PLI application
     {
-        void* lib = dlopen("./obj_vlt/t_vpi_time_cb/libvpi.so", RTLD_LAZY);
+        void* lib = dlopen(STRINGIFY(TEST_OBJ_DIR) "/libvpi.so", RTLD_LAZY);
         void* bootstrap = dlsym(lib, "vpi_compat_bootstrap");
         ((void (*)(void))bootstrap)();
     }
diff --git a/test_regress/t/t_vpi_zero_time_cb.cpp b/test_regress/t/t_vpi_zero_time_cb.cpp
index b134021d9..541d35ef9 100644
--- a/test_regress/t/t_vpi_zero_time_cb.cpp
+++ b/test_regress/t/t_vpi_zero_time_cb.cpp
@@ -171,7 +171,7 @@ int main(int argc, char** argv, char** env) {
 
     // Load and initialize the PLI application
     {
-        void* lib = dlopen("./obj_vlt/t_vpi_zero_time_cb/libvpi.so", RTLD_LAZY);
+        void* lib = dlopen(STRINGIFY(TEST_OBJ_DIR) "/libvpi.so", RTLD_LAZY);
         void* bootstrap = dlsym(lib, "vpi_compat_bootstrap");
         ((void (*)(void))bootstrap)();
     }