diff --git a/goborator.go b/goborator.go
index 2269715..dff9133 100644
--- a/goborator.go
+++ b/goborator.go
@@ -119,7 +119,8 @@ func (g *Gaborator) gaborTransform(audioData []float32) {
 				// keep the new maximum
 				g.mostRecentCoefficentIndex = coefficientIndex
 				// copy the oldest data to the history
-				g.fixedCoefficents = append(g.fixedCoefficents, g.coefficients[circularIndex])
+				g.fixedCoefficents = append(g.fixedCoefficents, make([]float32, len(g.coefficients[circularIndex])))
+				copy(g.fixedCoefficents[len(g.fixedCoefficents)-1], g.coefficients[circularIndex])
 
 				// fill the oldest with zeros
 				for j := range g.coefficients[circularIndex] {