diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index eb31d5502..8a3f20b72 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -553,7 +553,7 @@ string V3Options::filePath(FileLine* fl, const string& modname, const string& la
     // Find a filename to read the specified module name,
     // using the incdir and libext's.
     // Return "" if not found.
-    const string filename = V3Os::filenameCleanup(modname);
+    const string filename = V3Os::filenameCleanup(VName::dehash(modname));
     if (!V3Os::filenameIsRel(filename)) {
         // filename is an absolute path, so can find getStdPackagePath()
         string exists = filePathCheckOneDir(filename, "");
@@ -585,8 +585,8 @@ void V3Options::filePathLookedMsg(FileLine* fl, const string& modname) {
     static bool shown_notfound_msg = false;
     if (modname.find("__Vhsh") != string::npos) {
         std::cerr << V3Error::warnMoreStandalone()
-                  << "... Unsupported: Name is longer than 127 characters;"
-                  << " automatic file lookup not supported.\n";
+                  << "... Note: Name is longer than 127 characters; automatic"
+                  << " file lookup may have failed due to OS filename length limits.\n";
         std::cerr << V3Error::warnMoreStandalone()
                   << "... Suggest putting filename with this module/package"
                   << " onto command line instead.\n";
diff --git a/test_regress/t/t_inst_long.pl b/test_regress/t/t_inst_long.pl
new file mode 100755
index 000000000..425516114
--- /dev/null
+++ b/test_regress/t/t_inst_long.pl
@@ -0,0 +1,58 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+use IO::File;
+use strict;
+use vars qw($Self);
+
+scenarios(vlt => 1);
+
+my $length = 200;
+my $long = "long_" x (($length + 4) / 5);
+
+sub gen_top {
+    my $filename = shift;
+
+    my $fh = IO::File->new(">$filename")
+        or $Self->error("Can't write $filename");
+    $fh->print("// Generated by t_inst_long.pl\n");
+    $fh->print("module t;\n");
+    $fh->print("\n");
+    $fh->print("  ${long} inst ();\n");
+    $fh->print("\n");
+    $fh->print("endmodule\n");
+    $fh->close;
+}
+
+sub gen_sub {
+    my $filename = shift;
+
+    my $fh = IO::File->new(">$filename")
+        or $Self->error("Can't write $filename");
+    $fh->print("// Generated by t_inst_long.pl\n");
+    $fh->print("module ${long};\n");
+    $fh->print("\n");
+    $fh->print("  initial begin\n");
+    $fh->print("     \$write(\"*-* All Finished *-*\\n\");\n");
+    $fh->print("     \$finish;\n");
+    $fh->print("  end\n");
+    $fh->print("endmodule\n");
+    $fh->close;
+}
+
+top_filename("$Self->{obj_dir}/t_inst_long.v", $long);
+
+gen_top($Self->{top_filename});
+gen_sub("$Self->{obj_dir}/${long}.v");
+
+compile();
+
+ok(1);
+1;
diff --git a/test_regress/t/t_inst_long_bad.out b/test_regress/t/t_inst_long_bad.out
index 3020fe05a..bef6bf9a1 100644
--- a/test_regress/t/t_inst_long_bad.out
+++ b/test_regress/t/t_inst_long_bad.out
@@ -1,6 +1,6 @@
-%Error: obj_vlt/t_inst_long_bad/t_inst_long.v:4:3: Cannot find file containing module: 'long_long_long_long_long_long___Vhsh1JZCXQVBM1QiASYlLmgTuAXYyUr7VAbJYwVHfiAD'
-    4 |   long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_ inst ();
+%Error: t/t_inst_long_bad.v:9:3: Cannot find file containing module: 'long_long_long_long_long_long___Vhsh1JZCXQVBM1QiASYlLmgTuAXYyUr7VAbJYwVHfiAD'
+    9 |   long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_ inst ();
       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        ... Unsupported: Name is longer than 127 characters; automatic file lookup not supported.
+        ... Note: Name is longer than 127 characters; automatic file lookup may have failed due to OS filename length limits.
         ... Suggest putting filename with this module/package onto command line instead.
 %Error: Exiting due to
diff --git a/test_regress/t/t_inst_long_bad.pl b/test_regress/t/t_inst_long_bad.pl
index 73eaa142a..a60503a1f 100755
--- a/test_regress/t/t_inst_long_bad.pl
+++ b/test_regress/t/t_inst_long_bad.pl
@@ -8,49 +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
 
-use IO::File;
-use strict;
-use vars qw($Self);
-
-scenarios(vlt => 1);
-
-my $length = 200;
-my $long = "long_" x (($length + 4) / 5);
-
-sub gen_top {
-    my $filename = shift;
-
-    my $fh = IO::File->new(">$filename")
-        or $Self->error("Can't write $filename");
-    $fh->print("// Generated by t_inst_long.pl\n");
-    $fh->print("module t;\n");
-    $fh->print("\n");
-    $fh->print("  ${long} inst ();\n");
-    $fh->print("\n");
-    $fh->print("endmodule\n");
-    $fh->close;
-}
-
-sub gen_sub {
-    my $filename = shift;
-
-    my $fh = IO::File->new(">$filename")
-        or $Self->error("Can't write $filename");
-    $fh->print("// Generated by t_inst_long.pl\n");
-    $fh->print("module ${long};\n");
-    $fh->print("\n");
-    $fh->print("  initial begin\n");
-    $fh->print("     \$write(\"*-* All Finished *-*\\n\");\n");
-    $fh->print("     \$finish;\n");
-    $fh->print("  end\n");
-    $fh->print("endmodule\n");
-    $fh->close;
-}
-
-top_filename("$Self->{obj_dir}/t_inst_long.v", $long);
-
-gen_top($Self->{top_filename});
-gen_sub("$Self->{obj_dir}/${long}.v");
+scenarios(linter => 1);
 
 lint(
     fails => 1,
diff --git a/test_regress/t/t_inst_long_bad.v b/test_regress/t/t_inst_long_bad.v
new file mode 100644
index 000000000..5340a983a
--- /dev/null
+++ b/test_regress/t/t_inst_long_bad.v
@@ -0,0 +1,11 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2012 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t;
+
+  long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_long_ inst ();
+
+endmodule