diff --git a/src/behaviour_control/complementary_filter.cpp b/src/behaviour_control/complementary_filter.cpp
index 163572d..b9f214b 100644
--- a/src/behaviour_control/complementary_filter.cpp
+++ b/src/behaviour_control/complementary_filter.cpp
@@ -2,6 +2,7 @@
 
 ComplementaryFilter::ComplementaryFilter(float k){
     this->K = k;
+    this->oldVal = 0;
 }
 
 float result;