diff --git a/Changes b/Changes
index 6f43b38a6..8a0ffe606 100644
--- a/Changes
+++ b/Changes
@@ -22,7 +22,7 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ****  Fix ugly error on interface misuse, bug1525. [Bogdan Vukobratovic]
 
-****  Fix misc bad-syntax crashes, bug1529, bug1532. [Eric Rippey]
+****  Fix misc bad-syntax crashes, bug1529-bug1530, bug1532. [Eric Rippey]
 
 
 * Verilator 4.018 2019-08-29
diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index c6f5addcc..c7a91f1fd 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -31,6 +31,7 @@
 #include <iomanip>
 
 #define MAX_SPRINTF_DOUBLE_SIZE 100  // Maximum characters with a sprintf %e/%f/%g (probably < 30)
+#define MAX_WIDTH 5*1024  // Maximum width before error
 
 // Number operations build output in-place so can't call e.g. foo.opX(foo)
 #define NUM_ASSERT_OP_ARGS1(arg1)  \
@@ -106,7 +107,13 @@ void V3Number::V3NumberCreate(AstNode* nodep, const char* sourcep, FileLine* fl)
         value_startp = cp;
 
         if (atoi(widthn)) {
-            width(atoi(widthn), true);
+            if (atoi(widthn) < 0 || atoi(widthn) > MAX_WIDTH) {
+                // atoi might convert large number to negative, so can't tell which
+                v3error("Unsupported: Width of number exceeds implementation limit: "<<sourcep);
+                width(MAX_WIDTH, true);
+            } else {
+                width(atoi(widthn), true);
+            }
         }
     } else {
         unbased = true;
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index b4fd9dfe2..56c7c0680 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -416,7 +416,7 @@ sub sprint_summary {
     $out .= "  Failed-First $self->{fail1_cnt}";
     $out .= "  Skipped $self->{skip_cnt}";
     $out .= "  Unsup $self->{unsup_cnt}";
-    $out .= sprintf("  Eta %d:%02d", int($eta/60), $eta%60)  if $self->{left_cnt} && $eta > 10;
+    $out .= sprintf("  Eta %d:%02d", int($eta/60), $eta%60) if $self->{left_cnt} > 10 && $eta > 10;
     $out .= sprintf("  Time %d:%02d", int($delta/60), $delta%60);
     return $out;
 }
diff --git a/test_regress/t/t_fuzz_negwidth_bad.pl b/test_regress/t/t_fuzz_negwidth_bad.pl
new file mode 100755
index 000000000..fd7324fbf
--- /dev/null
+++ b/test_regress/t/t_fuzz_negwidth_bad.pl
@@ -0,0 +1,17 @@
+#!/usr/bin/perl
+if (!$::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(linter => 1);
+
+lint(
+    fails => 1,
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_fuzz_negwidth_bad.v b/test_regress/t/t_fuzz_negwidth_bad.v
new file mode 100644
index 000000000..730712a5c
--- /dev/null
+++ b/test_regress/t/t_fuzz_negwidth_bad.v
@@ -0,0 +1,7 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed into the Public Domain, for any use,
+// without warranty, 2019 by Wilson Snyder.
+
+int a = -12'd1;
+int b = 1231232312312312'd1;