diff --git a/test_regress/t/t_force_mid.cpp b/test_regress/t/t_force_mid.cpp
index 5afb7e5a3..ca91e6179 100644
--- a/test_regress/t/t_force_mid.cpp
+++ b/test_regress/t/t_force_mid.cpp
@@ -10,10 +10,12 @@
 // OS header
 #include "verilatedos.h"
 // Generated header
-#include "Vt_force_mid.h"
+#include VM_PREFIX_INCLUDE
 // General headers
 #include "verilated.h"
-std::unique_ptr<Vt_force_mid> topp;
+
+std::unique_ptr<VM_PREFIX> topp;
+
 int main(int argc, char** argv) {
     uint64_t sim_time = 1100;
     const std::unique_ptr<VerilatedContext> contextp{new VerilatedContext};
diff --git a/test_regress/t/t_tri_top_en_out.cpp b/test_regress/t/t_tri_top_en_out.cpp
index 39735e8e0..9035ce61e 100644
--- a/test_regress/t/t_tri_top_en_out.cpp
+++ b/test_regress/t/t_tri_top_en_out.cpp
@@ -7,7 +7,7 @@
 #include "verilated.h"
 
 #include "TestCheck.h"
-#include "Vt_tri_top_en_out.h"
+#include VM_PREFIX_INCLUDE
 
 #include <ctime>
 
@@ -18,7 +18,7 @@ int main(int argc, char** argv, char**) {
     const std::unique_ptr<VerilatedContext> contextp{new VerilatedContext};
     contextp->commandArgs(argc, argv);
     // Construct the Verilated model, from Vtop.h generated from Verilating
-    const std::unique_ptr<Vt_tri_top_en_out> topp{new Vt_tri_top_en_out{contextp.get()}};
+    const std::unique_ptr<VM_PREFIX> topp{new VM_PREFIX{contextp.get()}};
 
     // Initial input
     topp->drv_en = 0;