diff --git a/pasada-lib/ssf_filter.cpp b/pasada-lib/ssf_filter.cpp
index 6ec3d4e..0d43b06 100644
--- a/pasada-lib/ssf_filter.cpp
+++ b/pasada-lib/ssf_filter.cpp
@@ -72,9 +72,14 @@ double SsfStepDetector::filter(double ssf) {
     if (num_samples - n_refr >= len_refr) is_refr = false;
     // transition and not in refractory period? detected a step.
     if (is_txing && !is_refr) {
+        // !is_refr: catch trailing noise / first oscillation peak
         rv = 1.0;
         is_refr = true;
         n_refr = num_samples;
+    } else if (is_txing && is_refr) {
+        // catch oscillations / subsequent oscillation peaks
+        is_refr = true;
+        n_refr = num_samples;
     }
     if (num_samples == LEN_INIT) {
         // initial threshold setting