diff --git a/src/V3EmitCMake.cpp b/src/V3EmitCMake.cpp
index 8139cd418..d244469d1 100644
--- a/src/V3EmitCMake.cpp
+++ b/src/V3EmitCMake.cpp
@@ -229,6 +229,8 @@ class CMakeEmitter {
                     *of << deslash(" ${CMAKE_CURRENT_BINARY_DIR}/" + (*child)->hierWrapper(true));
                 }
                 *of << " ";
+                const string vFile = hblockp->vFileIfNecessary();
+                if (!vFile.empty()) *of << vFile << " ";
                 const V3StringList& vFiles = v3Global.opt.vFiles();
                 for (const string& i : vFiles) *of << V3Os::filenameRealPath(i);
                 *of << " VERILATOR_ARGS ";
diff --git a/src/V3HierBlock.cpp b/src/V3HierBlock.cpp
index 59adf8211..ae1bb1f86 100644
--- a/src/V3HierBlock.cpp
+++ b/src/V3HierBlock.cpp
@@ -80,6 +80,7 @@
 #include "V3Error.h"
 #include "V3File.h"
 #include "V3HierBlock.h"
+#include "V3Os.h"
 #include "V3String.h"
 #include "V3Stats.h"
 
@@ -88,13 +89,18 @@ static string V3HierCommandArgsFileName(const string& prefix, bool forCMake) {
            + (forCMake ? "_hierCMakeArgs.f" : "_hierMkArgs.f");
 }
 
-static void V3HierWriteCommonInputs(std::ostream* of, bool forCMake) {
+static void V3HierWriteCommonInputs(const V3HierBlock* hblockp, std::ostream* of, bool forCMake) {
+    string topModuleFile;
+    if (hblockp) topModuleFile = hblockp->vFileIfNecessary();
     if (!forCMake) {
+        if (!topModuleFile.empty()) *of << topModuleFile << "\n";
         const V3StringList& vFiles = v3Global.opt.vFiles();
         for (const string& i : vFiles) *of << i << "\n";
     }
     const V3StringSet& libraryFiles = v3Global.opt.libraryFiles();
-    for (const string& i : libraryFiles) *of << "-v " << i << "\n";
+    for (const string& i : libraryFiles) {
+        if (V3Os::filenameRealPath(i) != topModuleFile) *of << "-v " << i << "\n";
+    }
 }
 
 //######################################################################
@@ -194,6 +200,15 @@ string V3HierBlock::hierGenerated(bool withDir) const {
     return hierWrapper(withDir) + ' ' + hierMk(withDir);
 }
 
+string V3HierBlock::vFileIfNecessary() const {
+    const string filename = V3Os::filenameRealPath(m_modp->fileline()->filename());
+    for (const string v : v3Global.opt.vFiles()) {
+        // Already listed in vFiles, so no need to add the file.
+        if (filename == V3Os::filenameRealPath(v)) return "";
+    }
+    return filename;
+}
+
 void V3HierBlock::writeCommandArgsFile(bool forCMake) const {
     std::unique_ptr<std::ofstream> of(V3File::new_ofstream(commandArgsFileName(forCMake)));
     *of << "--cc\n";
@@ -205,7 +220,7 @@ void V3HierBlock::writeCommandArgsFile(bool forCMake) const {
         }
     }
     *of << "-Mdir " << v3Global.opt.makeDir() << "/" << hierPrefix() << " \n";
-    V3HierWriteCommonInputs(of.get(), forCMake);
+    V3HierWriteCommonInputs(this, of.get(), forCMake);
     const V3StringList& commandOpts = commandArgs(false);
     for (const string& opt : commandOpts) *of << opt << "\n";
     *of << hierBlockArgs().front() << "\n";
@@ -394,7 +409,7 @@ void V3HierBlockPlan::writeCommandArgsFiles(bool forCMake) const {
             *of << it->second->hierWrapper(true) << "\n";
         }
     }
-    V3HierWriteCommonInputs(of.get(), forCMake);
+    V3HierWriteCommonInputs(nullptr, of.get(), forCMake);
     if (!forCMake) {
         const V3StringSet& cppFiles = v3Global.opt.cppFiles();
         for (const string& i : cppFiles) *of << i << "\n";
diff --git a/src/V3HierBlock.h b/src/V3HierBlock.h
index 6bc0ce285..8a04dd3fb 100644
--- a/src/V3HierBlock.h
+++ b/src/V3HierBlock.h
@@ -85,6 +85,8 @@ public:
     string hierMk(bool withDir) const;
     string hierLib(bool withDir) const;
     string hierGenerated(bool withDir) const;
+    // Returns the original HDL file if it is not included in v3Global.opt.vFiles().
+    string vFileIfNecessary() const;
     // Write command line argumuents to .f file for this hierarchical block
     void writeCommandArgsFile(bool forCMake) const;
     string commandArgsFileName(bool forCMake) const;
diff --git a/test_regress/t/t_hier_block_libmod.pl b/test_regress/t/t_hier_block_libmod.pl
new file mode 100755
index 000000000..6fcdd000e
--- /dev/null
+++ b/test_regress/t/t_hier_block_libmod.pl
@@ -0,0 +1,23 @@
+#!/usr/bin/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.
+
+scenarios(vlt_all => 1);
+
+compile(
+    verilator_flags2 => ['--hierarchical',
+                         '-y', $Self->{t_dir} . '/t_flag_relinc_dir/chip',
+                         '+incdir+'. $Self->{t_dir} . '/t_flag_relinc_dir/include'],
+    );
+
+execute(
+    check_finished => 1,
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_hier_block_libmod.v b/test_regress/t/t_hier_block_libmod.v
new file mode 100644
index 000000000..deaeb9fe2
--- /dev/null
+++ b/test_regress/t/t_hier_block_libmod.v
@@ -0,0 +1,14 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed into the Public Domain, for any use,
+// without warranty, 2020 by Yutetsu TAKATSUKASA
+
+module t;
+   t_flag_relinc_sub i_t_flag_relinc_sub();
+endmodule
+
+`ifdef VERILATOR
+`verilator_config
+hier_block -module "t_flag_relinc_sub"
+`verilog
+`endif