diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index e4abd9f10..4448775d1 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -35,7 +35,7 @@
 //======================================================================
 // Errors
 
-void V3Number::v3errorEnd(std::ostringstream& str) {
+void V3Number::v3errorEnd(std::ostringstream& str) const {
     std::ostringstream nsstr;
     nsstr<<str.str();
     m_fileline->v3errorEnd(nsstr);
@@ -665,7 +665,10 @@ uint32_t V3Number::toUInt() const {
     UASSERT(!isFourState(), "toUInt with 4-state "<<*this);
     // We allow wide numbers that represent values <= 32 bits
     for (int i=1; i<words(); ++i) {
-        UASSERT(!m_value[i], "Value too wide for 32-bits expected in this context "<<*this);
+        if (m_value[i]) {
+            v3error("Value too wide for 32-bits expected in this context "<<*this);
+            break;
+        }
     }
     return m_value[0];
 }
@@ -699,7 +702,10 @@ vluint64_t V3Number::toUQuad() const {
     UASSERT(!isFourState(), "toUQuad with 4-state "<<*this);
     // We allow wide numbers that represent values <= 64 bits
     for (int i=2; i<words(); ++i) {
-        UASSERT(!m_value[i], "Value too wide for 64-bits expected in this context "<<*this);
+        if (m_value[i]) {
+            v3error("Value too wide for 64-bits expected in this context "<<*this);
+            break;
+        }
     }
     if (width()<=32) return (static_cast<vluint64_t>(toUInt()));
     return ((static_cast<vluint64_t>(m_value[1])<<VL_ULL(32))
diff --git a/src/V3Number.h b/src/V3Number.h
index 98b53d5e5..12196b35e 100644
--- a/src/V3Number.h
+++ b/src/V3Number.h
@@ -179,7 +179,7 @@ private:
         return displayed(m_fileline, vformat);
     }
 public:
-    void v3errorEnd(std::ostringstream& sstr);
+    void v3errorEnd(std::ostringstream& sstr) const;
     void width(int width, bool sized=true) {
         // Set width.  Only set m_width here, as we need to tweak vector size
         if (width) { m_sized = sized; m_width = width; }
diff --git a/test_regress/t/t_math_shift_over_bad.out b/test_regress/t/t_math_shift_over_bad.out
index e46ee6404..bc87aff04 100644
--- a/test_regress/t/t_math_shift_over_bad.out
+++ b/test_regress/t/t_math_shift_over_bad.out
@@ -1,3 +1,2 @@
-%Error: Internal Error: ../V3Number.cpp:668: Value too wide for 32-bits expected in this context 64'h123456789abcdef
-                        ... See the manual and http://www.veripool.org/verilator for more assistance.
-%Error: Command Failed
+%Error: t/t_math_shift_over_bad.v:18: Value too wide for 32-bits expected in this context 64'h123456789abcdef
+%Error: Exiting due to