1 files changed, 1 insertions, 0 deletions
diff --git a/toys/pending/bc.c b/toys/pending/bc.c
index bb5d86cb..b38d9872 100644
--- a/toys/pending/bc.c
+++ b/toys/pending/bc.c
@@ -1717,6 +1717,7 @@ static BcStatus bc_num_p(BcNum *a, BcNum *b, BcNum *c, size_t scale) {
   if (b->rdx) return bc_vm_err(BC_ERROR_MATH_NON_INTEGER);
 
   if (!b->len) {
+    if (b->neg) return bc_vm_err(BC_ERROR_MATH_DIVIDE_BY_ZERO);
     bc_num_one(c);
     return BC_STATUS_SUCCESS;
   }