diff --git a/grc/satnogs_iq_sink.block.yml b/grc/satnogs_iq_sink.block.yml
index b3cb30d..6678ca8 100644
--- a/grc/satnogs_iq_sink.block.yml
+++ b/grc/satnogs_iq_sink.block.yml
@@ -33,7 +33,5 @@ inputs:
 templates:
   imports: import satnogs
   make: satnogs.iq_sink(${scale}, ${filename}, ${append}, ${activate})
-  callbacks:
-  - open(${filename})
 
 file_format: 1
diff --git a/include/satnogs/iq_sink.h b/include/satnogs/iq_sink.h
index 23e9ff2..651982d 100644
--- a/include/satnogs/iq_sink.h
+++ b/include/satnogs/iq_sink.h
@@ -23,7 +23,6 @@
 
 #include <satnogs/api.h>
 #include <gnuradio/sync_block.h>
-#include <gnuradio/blocks/file_sink_base.h>
 
 namespace gr {
 namespace satnogs {
@@ -36,8 +35,7 @@ namespace satnogs {
  * \ingroup satnogs
  *
  */
-class SATNOGS_API iq_sink : virtual public gr::sync_block,
-  virtual public gr::blocks::file_sink_base {
+class SATNOGS_API iq_sink : virtual public gr::sync_block {
 public:
   typedef boost::shared_ptr<iq_sink> sptr;
 
diff --git a/lib/iq_sink_impl.cc b/lib/iq_sink_impl.cc
index f600d8a..dade3fa 100644
--- a/lib/iq_sink_impl.cc
+++ b/lib/iq_sink_impl.cc
@@ -26,6 +26,7 @@
 #include "iq_sink_impl.h"
 #include <volk/volk.h>
 #include <stdexcept>
+#include <gnuradio/blocks/null_sink.h>
 
 namespace gr {
 namespace satnogs {
@@ -46,11 +47,27 @@ iq_sink_impl::iq_sink_impl(const float scale, const char *filename,
   gr::sync_block("iq_sink",
                  gr::io_signature::make(1, 1, sizeof(gr_complex)),
                  gr::io_signature::make(0, 0, 0)),
-  file_sink_base(filename, true, append),
+  file_sink_base(),
   d_scale(scale),
   d_num_points(16384),
   d_status((iq_sink_status_t) status)
 {
+  d_fp = 0;
+  d_new_fp = 0;
+  d_updated = false;
+  d_is_binary = true;
+  d_append = append;
+  /*
+   * Because the constructor of the derived class explicitly calls the open()
+   * and we want to avoid trying to open and invalid file in case of the
+   * user option is for bypassing this block, we call it explicitly
+   */
+  if (status == IQ_SINK_STATUS_ACTIVE) {
+    if (!open(filename)) {
+      throw std::invalid_argument("IQ File Sink: Could not open file");
+    }
+  }
+
   set_max_noutput_items(d_num_points);
   unsigned int alignment = volk_get_alignment();
   d_out = (int16_t *) volk_malloc(sizeof(int16_t) * d_num_points * 2,
diff --git a/lib/iq_sink_impl.h b/lib/iq_sink_impl.h
index ff78a8c..24db436 100644
--- a/lib/iq_sink_impl.h
+++ b/lib/iq_sink_impl.h
@@ -22,13 +22,14 @@
 #define INCLUDED_SATNOGS_IQ_SINK_IMPL_H
 
 #include <satnogs/iq_sink.h>
+#include <gnuradio/blocks/file_sink_base.h>
 #include <chrono>
 #include <fstream>
 
 namespace gr {
 namespace satnogs {
 
-class iq_sink_impl : public iq_sink {
+class iq_sink_impl : public iq_sink, public gr::blocks::file_sink_base {
 private:
   /**
    * The different values for iq sink status