diff --git a/test_regress/t/t_vpi_time_cb.cpp b/test_regress/t/t_vpi_time_cb.cpp
index 54d61a4a1..fea6e218d 100644
--- a/test_regress/t/t_vpi_time_cb.cpp
+++ b/test_regress/t/t_vpi_time_cb.cpp
@@ -45,18 +45,6 @@ unsigned int callback_count_start_of_sim = 0;
 
 //======================================================================
 
-#define CHECK_RESULT_VH(got, exp) \
-    if ((got) != (exp)) { \
-        printf("%%Error: %s:%d: GOT = %p   EXP = %p\n", __FILE__, __LINE__, (got), (exp)); \
-        return __LINE__; \
-    }
-
-#define CHECK_RESULT_NZ(got) \
-    if (!(got)) { \
-        printf("%%Error: %s:%d: GOT = NULL  EXP = !NULL\n", __FILE__, __LINE__); \
-        return __LINE__; \
-    }
-
 // Use cout to avoid issues with %d/%lx etc
 #define CHECK_RESULT(got, exp) \
     if ((got) != (exp)) { \
@@ -65,26 +53,6 @@ unsigned int callback_count_start_of_sim = 0;
         return __LINE__; \
     }
 
-#define CHECK_RESULT_HEX(got, exp) \
-    if ((got) != (exp)) { \
-        std::cout << std::dec << "%Error: " << __FILE__ << ":" << __LINE__ << hex \
-                  << ": GOT = " << (got) << "   EXP = " << (exp) << std::endl; \
-        return __LINE__; \
-    }
-
-#define CHECK_RESULT_CSTR(got, exp) \
-    if (strcmp((got), (exp))) { \
-        printf("%%Error: %s:%d: GOT = '%s'   EXP = '%s'\n", __FILE__, __LINE__, \
-               (got) ? (got) : "<null>", (exp) ? (exp) : "<null>"); \
-        return __LINE__; \
-    }
-
-#define CHECK_RESULT_CSTR_STRIP(got, exp) CHECK_RESULT_CSTR(got + strspn(got, " "), exp)
-
-// We cannot replace those with VL_STRINGIFY, not available when PLI is build
-#define STRINGIFY(x) STRINGIFY2(x)
-#define STRINGIFY2(x) #x
-
 //======================================================================
 
 #ifdef IS_VPI
@@ -243,12 +211,12 @@ int main(int argc, char** argv, char** env) {
     VL_PRINTF("Enabling waves...\n");
     VerilatedVcdC* tfp = new VerilatedVcdC;
     topp->trace(tfp, 99);
-    tfp->open(STRINGIFY(TEST_OBJ_DIR) "/simx.vcd");
+    tfp->open(VL_STRINGIFY(TEST_OBJ_DIR) "/simx.vcd");
 #endif
 
     // Load and initialize the PLI application
     {
-        const char* filenamep = STRINGIFY(TEST_OBJ_DIR) "/libvpi.so";
+        const char* filenamep = VL_STRINGIFY(TEST_OBJ_DIR) "/libvpi.so";
         void* lib = dlopen(filenamep, RTLD_LAZY);
         void* bootstrap = dlsym(lib, "vpi_compat_bootstrap");
         if (!bootstrap) {
diff --git a/test_regress/t/t_vpi_time_cb.pl b/test_regress/t/t_vpi_time_cb.pl
index 0f61b3e1c..b08bfa811 100755
--- a/test_regress/t/t_vpi_time_cb.pl
+++ b/test_regress/t/t_vpi_time_cb.pl
@@ -8,7 +8,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 # Version 2.0.
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
-scenarios(simulator => 1, iv => 1);
+scenarios(simulator => 1);
 
 compile(
     make_top_shell => 0,
diff --git a/test_regress/t/t_vpi_zero_time_cb.cpp b/test_regress/t/t_vpi_zero_time_cb.cpp
index 00b3a9c28..7127f2d47 100644
--- a/test_regress/t/t_vpi_zero_time_cb.cpp
+++ b/test_regress/t/t_vpi_zero_time_cb.cpp
@@ -44,18 +44,6 @@ unsigned int callback_count_start_of_sim = 0;
 
 //======================================================================
 
-#define CHECK_RESULT_VH(got, exp) \
-    if ((got) != (exp)) { \
-        printf("%%Error: %s:%d: GOT = %p   EXP = %p\n", __FILE__, __LINE__, (got), (exp)); \
-        return __LINE__; \
-    }
-
-#define CHECK_RESULT_NZ(got) \
-    if (!(got)) { \
-        printf("%%Error: %s:%d: GOT = NULL  EXP = !NULL\n", __FILE__, __LINE__); \
-        return __LINE__; \
-    }
-
 // Use cout to avoid issues with %d/%lx etc
 #define CHECK_RESULT(got, exp) \
     if ((got) != (exp)) { \
@@ -64,22 +52,6 @@ unsigned int callback_count_start_of_sim = 0;
         return __LINE__; \
     }
 
-#define CHECK_RESULT_HEX(got, exp) \
-    if ((got) != (exp)) { \
-        std::cout << std::dec << "%Error: " << __FILE__ << ":" << __LINE__ << hex \
-                  << ": GOT = " << (got) << "   EXP = " << (exp) << std::endl; \
-        return __LINE__; \
-    }
-
-#define CHECK_RESULT_CSTR(got, exp) \
-    if (strcmp((got), (exp))) { \
-        printf("%%Error: %s:%d: GOT = '%s'   EXP = '%s'\n", __FILE__, __LINE__, \
-               (got) ? (got) : "<null>", (exp) ? (exp) : "<null>"); \
-        return __LINE__; \
-    }
-
-#define CHECK_RESULT_CSTR_STRIP(got, exp) CHECK_RESULT_CSTR(got + strspn(got, " "), exp)
-
 //======================================================================
 
 #ifdef IS_VPI
diff --git a/test_regress/t/t_vpi_zero_time_cb.pl b/test_regress/t/t_vpi_zero_time_cb.pl
index 767fd64a2..24ae29812 100755
--- a/test_regress/t/t_vpi_zero_time_cb.pl
+++ b/test_regress/t/t_vpi_zero_time_cb.pl
@@ -8,7 +8,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 # Version 2.0.
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
-scenarios(simulator => 1, iv => 1);
+scenarios(simulator => 1);
 
 compile(
     make_top_shell => 0,