diff --git a/test_regress/t/t_instr_count_dpi_large.cpp b/test_regress/t/t_dpi_instr_count_large.cpp
similarity index 100%
rename from test_regress/t/t_instr_count_dpi_large.cpp
rename to test_regress/t/t_dpi_instr_count_large.cpp
diff --git a/test_regress/t/t_instr_count_dpi_large.py b/test_regress/t/t_dpi_instr_count_large.py
similarity index 93%
rename from test_regress/t/t_instr_count_dpi_large.py
rename to test_regress/t/t_dpi_instr_count_large.py
index 6f1f40d34..09a785c38 100755
--- a/test_regress/t/t_instr_count_dpi_large.py
+++ b/test_regress/t/t_dpi_instr_count_large.py
@@ -13,7 +13,7 @@ test.scenarios('vltmt')
 test.clean_objs()
 
 test.compile(
-    v_flags2=["t/t_instr_count_dpi_large.cpp"],
+    v_flags2=["t/t_dpi_instr_count_large.cpp"],
     verilator_flags2=[
         "--instr-count-dpi 999999999",
         # Force UNOPTTHREADS error to cause Contraction limit increase beyond UINT32
diff --git a/test_regress/t/t_instr_count_dpi_large.v b/test_regress/t/t_dpi_instr_count_large.v
similarity index 100%
rename from test_regress/t/t_instr_count_dpi_large.v
rename to test_regress/t/t_dpi_instr_count_large.v
diff --git a/test_regress/t/t_instr_count_dpi_large_hier.py b/test_regress/t/t_dpi_instr_count_large_hier.py
similarity index 88%
rename from test_regress/t/t_instr_count_dpi_large_hier.py
rename to test_regress/t/t_dpi_instr_count_large_hier.py
index e0d5bdaf5..1ecd190a0 100755
--- a/test_regress/t/t_instr_count_dpi_large_hier.py
+++ b/test_regress/t/t_dpi_instr_count_large_hier.py
@@ -11,10 +11,10 @@ import vltest_bootstrap
 
 test.scenarios('vltmt')
 test.clean_objs()
-test.top_filename = "t/t_instr_count_dpi_large.v"
+test.top_filename = "t/t_dpi_instr_count_large.v"
 
 test.compile(
-    v_flags2=["t/t_instr_count_dpi_large.cpp"],
+    v_flags2=["t/t_dpi_instr_count_large.cpp"],
     verilator_flags2=[
         "--hierarchical",
         "--instr-count-dpi 999999999",