diff --git a/firmware/baseband/matched_filter.cpp b/firmware/baseband/matched_filter.cpp
index 511410df..9471a202 100644
--- a/firmware/baseband/matched_filter.cpp
+++ b/firmware/baseband/matched_filter.cpp
@@ -38,6 +38,7 @@ void MatchedFilter::configure(
 	taps_reversed_ = std::make_unique<taps_t>(taps_count);
 	taps_count_ = taps_count;
 	decimation_factor_ = decimation_factor;
+	output = 0;
 	std::reverse_copy(&taps[0], &taps[taps_count], &taps_reversed_[0]);
 }
 
diff --git a/firmware/baseband/matched_filter.hpp b/firmware/baseband/matched_filter.hpp
index d3ee30be..49045db8 100644
--- a/firmware/baseband/matched_filter.hpp
+++ b/firmware/baseband/matched_filter.hpp
@@ -71,7 +71,7 @@ private:
 	size_t taps_count_ { 0 };
 	size_t decimation_factor_ { 1 };
 	size_t decimation_phase { 0 };
-	float output;
+	float output { 0 };
 
 	void shift_by_decimation_factor();