1 files changed, 3 insertions, 3 deletions

diff --git a/src/utils/math.h b/src/utils/math.h
index f2176b6..0c56861 100644
--- a/src/utils/math.h
+++ b/src/utils/math.h
@@ -73,10 +73,10 @@ indextoperm(uint64_t p, size_t n, uint8_t *r)
 
                 /* Find k-th unused number */
                 for (j = 0, c = 0; c <= k; j++)
-                        c += 1 - ((used & (1<<j)) >> j);
+                        c += UINT64_C(1) - ((used & (UINT64_C(1)<<j)) >> j);
 
-                r[i] = j-1;
-                used |= 1 << (j-1);
+                r[i] = (uint8_t)(j-1);
+                used |= UINT64_C(1) << (j-1);
                 p %= factorial[n-i-1];
         }