diff --git a/Changes b/Changes
index 39befa53f..4191175e0 100644
--- a/Changes
+++ b/Changes
@@ -8,6 +8,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Suppress VARHIDDEN on dpi import arguments.  [Ruben Diez]
 
+****  Fix dpi exports with > 32 bit but < 64 bit args, bug423. [Chandan Egbert]
+
 
 * Verilator 3.830 2011/11/27
 
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index 052ff2343..683021643 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -627,7 +627,7 @@ private:
 	    ket += ")";
 	}
 	if (!cvt
-	    && portp->basicp() && portp->basicp()->isBitLogic() && portp->widthMin() != 1 && !portp->isWide())
+	    && portp->basicp() && portp->basicp()->isBitLogic() && portp->widthMin() != 1 && !portp->isWide() && !portp->isQuad())
 	    stmt += "*";  // it's a svBitVecVal, which other code won't think is arrayed (as WData aren't), but really is
 	stmt += frName;
 	stmt += ket;
diff --git a/test_regress/t/t_dpi_qw.pl b/test_regress/t/t_dpi_qw.pl
new file mode 100755
index 000000000..cd7f6f5d3
--- /dev/null
+++ b/test_regress/t/t_dpi_qw.pl
@@ -0,0 +1,20 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2011 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.
+
+compile (
+	 v_flags2 => ["t/t_dpi_qw_c.cpp"],
+	 verilator_flags2 => ["-Wall -Wno-DECLFILENAME -no-l2name"],
+	 );
+
+execute (
+	 check_finished=>1,
+     );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_dpi_qw.v b/test_regress/t/t_dpi_qw.v
new file mode 100644
index 000000000..e7d1fb455
--- /dev/null
+++ b/test_regress/t/t_dpi_qw.v
@@ -0,0 +1,41 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// Copyright 2009 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.
+
+module t;
+
+    wire [39:0] out;
+    sub a(.value(out));
+
+   import "DPI-C" context function void poke_value(input int i);
+
+
+   initial begin
+       poke_value(32'hdeadbeef);
+       if (out !== 40'hdeadbeef) begin
+           $display("[%0t] %%Error: t_dpi_qw: failed", $time);
+	       $stop;
+       end
+
+       $write("*-* All Finished *-*\n");
+       $finish;
+   end
+
+endmodule
+
+module sub(value);
+    parameter WIDTH = 40;
+
+    output [WIDTH-1:0] value;
+
+    reg [WIDTH-1:0] value;
+
+    task set_value(input bit [WIDTH-1:0] v);
+        value = v;
+    endtask
+
+    export "DPI-C" task set_value;
+endmodule
diff --git a/test_regress/t/t_dpi_qw_c.cpp b/test_regress/t/t_dpi_qw_c.cpp
new file mode 100644
index 000000000..b8af96eda
--- /dev/null
+++ b/test_regress/t/t_dpi_qw_c.cpp
@@ -0,0 +1,44 @@
+// -*- C++ -*-
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// Copyright 2009 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.
+//*************************************************************************
+
+#include <cstdio>
+#include <cstring>
+#include "svdpi.h"
+
+//======================================================================
+
+#include "Vt_dpi_qw__Dpi.h"
+
+//======================================================================
+
+// Called from our Verilog code to run the tests
+void poke_value(int i) {
+    printf("poke_value(%d)\n", i);
+
+#ifdef VERILATOR
+    static int didDump = 0;
+    if (didDump++ == 0) {
+# ifdef TEST_VERBOSE
+	Verilated::scopesDump();
+# endif
+    }
+#endif
+
+    svScope scope = svGetScopeFromName("top.t.a");
+    if (scope == NULL) {
+        printf("%%Error: null scope for top.t.a\n");
+        return;
+    }
+
+    svSetScope(scope);
+    svBitVecVal val[2];
+    val[0] = i;
+    val[1] = 0;
+    set_value(val);
+}