diff --git a/ambed/cfirfilter.h b/ambed/cfirfilter.h
index 43c2c31..52e4b7b 100644
--- a/ambed/cfirfilter.h
+++ b/ambed/cfirfilter.h
@@ -28,7 +28,7 @@
 
 #include "csampleprocessor.h"
 
-class CFIRFilter
+class CFIRFilter : CSampleProcessor
 {
 public :
     //Constructor