diff --git a/terminal.c b/terminal.c
index 06f41e44..afc9b2c2 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1085,19 +1085,21 @@ static termline *lineptr(Terminal *term, int y, int lineno, int screen)
 
     /* We assume that we don't screw up and retrieve something out of range. */
     if (line == NULL) {
+        extern const char commitid[]; /* in version.c */
 	modalfatalbox("line==NULL in terminal.c\n"
                       "lineno=%d y=%d w=%d h=%d\n"
                       "count(scrollback=%p)=%d\n"
                       "count(screen=%p)=%d\n"
                       "count(alt=%p)=%d alt_sblines=%d\n"
-                      "whichtree=%p treeindex=%d\n\n"
+                      "whichtree=%p treeindex=%d\n"
+                      "commitid=%s\n\n"
                       "Please contact <putty@projects.tartarus.org> "
                       "and pass on the above information.",
                       lineno, y, term->cols, term->rows,
                       term->scrollback, count234(term->scrollback),
                       term->screen, count234(term->screen),
                       term->alt_screen, count234(term->alt_screen),
-                      term->alt_sblines, whichtree, treeindex);
+                      term->alt_sblines, whichtree, treeindex, commitid);
     }
     assert(line != NULL);