diff --git a/VERSION b/VERSION
index 66dd59a..af0cfc2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.5.190
+1.5.191
diff --git a/base/netcmp.c b/base/netcmp.c
index 5c0b75f..6bdd803 100644
--- a/base/netcmp.c
+++ b/base/netcmp.c
@@ -7225,8 +7225,13 @@ int MatchPins(struct nlist *tc1, struct nlist *tc2, int dolist)
 			      snprintf(ostr, left_col_end, "%s", obn->name);
 			      if ((*matchfunc)(obn->name, obp->name))
 			         snprintf(ostr + left_col_end + 1, left_col_end, "%s", obp->name);
-			      else
+			      else {
 			         snprintf(ostr + left_col_end + 1, left_col_end, "%s **Mismatch**", obp->name);
+				 /* Pins with different names are on different nets,
+				  * so this should trigger an error return code.
+				  */
+				 result = 0;
+			      }
 			      for (m = 0; m < right_col_end + 1; m++)
 				 if (*(ostr + m) == '\0') *(ostr + m) = ' ';
 			      Fprintf(stdout, ostr);