diff --git a/tools/chatgui/tests/test_call_jitter.cpp b/tools/chatgui/tests/test_call_jitter.cpp
index 1fa31a3d..ed72a323 100644
--- a/tools/chatgui/tests/test_call_jitter.cpp
+++ b/tools/chatgui/tests/test_call_jitter.cpp
@@ -83,7 +83,13 @@ int main() {
         for (int i = 0; i < 100; i++) call_jitter_pull(j, pcm, 480);
         size_t before = d.seen.size();
         push(j, next++); push(j, next++);
-        CHECK(call_jitter_pull(j, pcm, 480) == 0);
+        int refill = call_jitter_pull(j, pcm, 480);
+        if (refill) {
+            call_jitter_get_stats(j, &depth, nullptr, nullptr, nullptr, &range);
+            DEBUG_ERROR(DEBUG_CATEGORY_CALL, "refill check: pcm=%d remaining=%dms reserve=%dms decoded=%zu",
+                        refill, depth, range.reserve_ms, d.seen.size() - before);
+        }
+        CHECK(refill == 0);
         CHECK(d.seen.size() == before);
         for (int i = 0; i < 50; i++) push(j, next++);
         CHECK(call_jitter_pull(j, pcm, 480) > 0);