diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c
index b49b7e08d2..4f8f5fbab0 100644
--- a/src/or/circuitbuild.c
+++ b/src/or/circuitbuild.c
@@ -660,9 +660,9 @@ circuit_build_times_update_state(circuit_build_times_t *cbt,
 static void
 circuit_build_times_shuffle_and_store_array(circuit_build_times_t *cbt,
                                             build_time_t *raw_times,
-                                            int num_times)
+                                            uint32_t num_times)
 {
-  int n = num_times;
+  uint32_t n = num_times;
   if (num_times > CBT_NCIRCUITS_TO_OBSERVE) {
     log_notice(LD_CIRC, "The number of circuit times that this Tor version "
                "uses to calculate build times is less than the number stored "