fix filepaths set edge case

1 files changed, 1 insertions, 1 deletions

diff --git a/src/util.cff b/src/util.cff
index 30175a3..c56486b 100644
--- a/src/util.cff
+++ b/src/util.cff
@@ -60,7 +60,7 @@ extern fn addfilepath(s *const u8) int {
       } else if streq(filepaths[i], s) {
          return i;
       }
-   } while ++i != i0;
+   } while (i = (i + 1) % filepaths.#len) != i0;
 
    assert(nfilepaths++ < filepaths.#len, "too many files");
    filepaths[i] = s;