diff --git a/src/main/common/filter.c b/src/main/common/filter.c
index ef2d624512..cbbc94697f 100644
--- a/src/main/common/filter.c
+++ b/src/main/common/filter.c
@@ -208,6 +208,8 @@ void laggedMovingAverageInit(laggedMovingAverage_t *filter, uint16_t windowSize,
     filter->movingWindowIndex = 0;
     filter->windowSize = windowSize;
     filter->buf = buf;
+    filter->movingSum = 0;
+    memset(filter->buf, 0, windowSize * sizeof(float));
     filter->primed = false;
 }