diff --git a/src/tools/PrintAdapter.h b/src/tools/PrintAdapter.h
index 54ca4c0..0c660c6 100644
--- a/src/tools/PrintAdapter.h
+++ b/src/tools/PrintAdapter.h
@@ -9,7 +9,7 @@
 #ifndef HEADER_PRINTADAPTER
     #define HEADER_PRINTADAPTER
 
-        class PrintAdapter : public StreamExtension{
+        class PrintAdapter : public PrintExtension, public StreamExtension{
             public:
             
                 PrintAdapter( Print &target ) : out(target) {}