diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index fc2637b1a..b22900a99 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -7006,9 +7006,12 @@ static void inp_poly_err(struct card *card)
 void tprint(struct card *t)
 {
     struct card *tmp;
-
+    static int npr;
+    char outfile[100];
+    sprintf(outfile, "tprint-out%d.txt", npr);
+    npr++;
     /*debug: print into file*/
-    FILE *fd = fopen("tprint-out.txt", "w");
+    FILE *fd = fopen(outfile, "w");
     for (tmp = t; tmp; tmp = tmp->nextcard)
         if (*(tmp->line) != '*')
             fprintf(fd, "%6d  %6d  %s\n", tmp->linenum_orig, tmp->linenum,