diff --git a/cpu.cpp b/cpu.cpp
index 66ad8fe..8513971 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -78,7 +78,7 @@ std::tuple<double, double, uint64_t, uint32_t, double> cpu::get_mips_rel_speed(c
 
         uint64_t t_diff = t_diff_in.has_value() ? t_diff_in.value() : (get_us() - running_since - wait_time);
 
-        double mips = instr_count / double(t_diff);
+        double mips = t_diff ? instr_count / double(t_diff) : 0;
 
         // see https://retrocomputing.stackexchange.com/questions/6960/what-was-the-clock-speed-and-ips-for-the-original-pdp-11
         constexpr double pdp11_clock_cycle = 150;  // ns, for the 11/70
diff --git a/debugger.cpp b/debugger.cpp
index dd42648..fc68676 100644
--- a/debugger.cpp
+++ b/debugger.cpp
@@ -211,7 +211,7 @@ void reg_dump(console *const cnsl, cpu *const c)
 
 void show_run_statistics(console *const cnsl, cpu *const c)
 {
-	auto stats = c->get_mips_rel_speed({ }, false);
+	auto stats = c->get_mips_rel_speed({ }, { });
 
 	cnsl->put_string_lf(format("Executed %zu instructions in %.2f ms of which %.2f ms idle", size_t(std::get<2>(stats)), std::get<3>(stats) / 1000., std::get<4>(stats) / 1000.));
 	cnsl->put_string_lf(format("MIPS: %.2f, relative speed: %.2f%%", std::get<0>(stats), std::get<1>(stats)));
diff --git a/main.cpp b/main.cpp
index 6bb27f1..2105127 100644
--- a/main.cpp
+++ b/main.cpp
@@ -551,7 +551,7 @@ int main(int argc, char *argv[])
 				break;
 		}
 
-		auto stats = c->get_mips_rel_speed({ }, false);
+		auto stats = c->get_mips_rel_speed({ }, { });
 		cnsl->put_string_lf(format("MIPS: %.2f, relative speed: %.2f%%, instructions executed: %" PRIu64 " in %.2f seconds", std::get<0>(stats), std::get<1>(stats), std::get<2>(stats), std::get<3>(stats) / 1000000.));
 	}