diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index 1e1360f33..2c6491845 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -74,6 +74,12 @@ void V3Number::v3errorEnd(std::ostringstream& str) const {
     }
 }
 
+void V3Number::v3errorEndFatal(std::ostringstream& str) const {
+    v3errorEnd(str);
+    assert(0);
+    VL_UNREACHABLE
+}
+
 //======================================================================
 // Read class functions
 // CREATION
diff --git a/src/V3Number.h b/src/V3Number.h
index 363868a9a..432fe8af4 100644
--- a/src/V3Number.h
+++ b/src/V3Number.h
@@ -204,6 +204,7 @@ private:
 
 public:
     void v3errorEnd(std::ostringstream& sstr) const;
+    void v3errorEndFatal(std::ostringstream& sstr) const VL_ATTR_NORETURN;
     void width(int width, bool sized = true) {
         // Set width.  Only set m_width here, as we need to tweak vector size
         if (width) {
diff --git a/test_regress/t/t_dynarray_bad.out b/test_regress/t/t_dynarray_bad.out
index 7bb4e86b5..ad5729bd3 100644
--- a/test_regress/t/t_dynarray_bad.out
+++ b/test_regress/t/t_dynarray_bad.out
@@ -3,4 +3,6 @@
    15 |       a = new [s];   
       |           ^~~
                 ... Use "/* verilator lint_off WIDTH */" and lint_on around source to disable this message.
-%Error: Internal Error: ../V3Number.cpp:#: Number operation called with non-logic (double or string) argument: '"str""
+%Error: Internal Error: t/t_dynarray_bad.v:15:16: ../V3Number.cpp:#: Number operation called with non-logic (double or string) argument: '"str""
+   15 |       a = new [s];   
+      |                ^
diff --git a/test_regress/t/t_select_bad_tri.out b/test_regress/t/t_select_bad_tri.out
index 9405b76e2..2fd802546 100644
--- a/test_regress/t/t_select_bad_tri.out
+++ b/test_regress/t/t_select_bad_tri.out
@@ -1,4 +1,7 @@
 %Error: t/t_select_bad_tri.v:11:24: Selection index is constantly unknown or tristated: 1'bx
    11 |       if (in[(   (1'h0 / 1'b0)   )+:71] != 71'h0) $stop;
       |                        ^
-%Error: Internal Error: ../V3Number.cpp:#: toUInt with 4-state 1'bx
+%Error: Internal Error: t/t_select_bad_tri.v:11:24: ../V3Number.cpp:#: toUInt with 4-state 1'bx
+                                                  : ... In instance t
+   11 |       if (in[(   (1'h0 / 1'b0)   )+:71] != 71'h0) $stop;
+      |                        ^