diff --git a/src/or/shared_random.c b/src/or/shared_random.c
index 5f61170d5e..79151255fa 100644
--- a/src/or/shared_random.c
+++ b/src/or/shared_random.c
@@ -248,7 +248,7 @@ commit_decode(const char *encoded, sr_commit_t *commit)
 
   if (decoded_len != SR_COMMIT_LEN) {
     log_warn(LD_BUG, "SR: Commit from authority %s decoded length doesn't "
-                     "match the expected length (%d vs %d).",
+                     "match the expected length (%d vs %lu).",
              sr_commit_get_rsa_fpr(commit), decoded_len, SR_COMMIT_LEN);
     goto error;
   }
@@ -301,7 +301,7 @@ reveal_decode(const char *encoded, sr_commit_t *commit)
 
   if (decoded_len != SR_REVEAL_LEN) {
     log_warn(LD_BUG, "SR: Reveal from authority %s decoded length is "
-                     "doesn't match the expected length (%d vs %d)",
+                     "doesn't match the expected length (%d vs %lu)",
              sr_commit_get_rsa_fpr(commit), decoded_len, SR_REVEAL_LEN);
     goto error;
   }