diff --git a/backends/playback/zsm/zsm_backend.cpp b/backends/playback/zsm/zsm_backend.cpp
index 33c5c21..394ac77 100644
--- a/backends/playback/zsm/zsm_backend.cpp
+++ b/backends/playback/zsm/zsm_backend.cpp
@@ -210,7 +210,7 @@ void ZsmBackend::tick(bool step) {
     size_t nextCpuClocksInt = std::floor(nextCpuClocks);
     size_t prevCpuClocksInt = std::floor(prevCpuClocks);
     size_t cpuClocksIntDelta = nextCpuClocksInt - prevCpuClocksInt;
-    audio_step(cpuClocksIntDelta);
+    audio_step(ticks_remaining);
     cpuClocks = std::fmod(nextCpuClocks, ClocksPerTick);
 }
 size_t ZsmBackend::render(void *buf, size_t maxlen) {