diff --git a/libcpuid/rdtsc.c b/libcpuid/rdtsc.c
index a13d983..5930681 100644
--- a/libcpuid/rdtsc.c
+++ b/libcpuid/rdtsc.c
@@ -275,7 +275,7 @@ int cpu_clock_by_ic(int millis, int runs)
 			sys_precise_clock(&t1);
 		} while (t1 - t0 < tl * (uint64_t) 8);
 		// cpu_Hz = cycles_inner * cycles_outer * 256 / (t1 - t0) * 1000000
-		debugf(2, "c = %d, td = %llu\n", c, t1 - t0);
+		debugf(2, "c = %d, td = %d\n", c, (int) (t1 - t0));
 		hz = ((uint64_t) cycles_inner * (uint64_t) 256 + 12) * 
 		     (uint64_t) cycles_outer * (uint64_t) multiplier_numerator * (uint64_t) c * (uint64_t) 1000000
 		     / ((t1 - t0) * (uint64_t) multiplier_denom);