diff --git a/lib/flow_control/burst_sdcch_subslot_filter_impl.cc b/lib/flow_control/burst_sdcch_subslot_filter_impl.cc
index 9f27fcd..33e67b8 100644
--- a/lib/flow_control/burst_sdcch_subslot_filter_impl.cc
+++ b/lib/flow_control/burst_sdcch_subslot_filter_impl.cc
@@ -30,6 +30,14 @@
 #include <grgsm/endian.h>
 #include <grgsm/gsmtap.h>
 
+static const int8_t subslots_sdcch4[102] = {
+  -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
+  -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
+};
+static const int8_t subslots_sdcch8[102] = {
+  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
+  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
+};
 
 namespace gr {
   namespace gsm {
@@ -49,7 +57,8 @@ namespace gr {
               gr::io_signature::make(0, 0, 0),
               gr::io_signature::make(0, 0, 0)),
       d_mode(mode),
-      d_subslot(subslot)
+      d_subslots_sdcch4(subslots_sdcch4),
+      d_subslots_sdcch8(subslots_sdcch8)      
     {     
         message_port_register_in(pmt::mp("in"));
         message_port_register_out(pmt::mp("out"));
diff --git a/lib/flow_control/burst_sdcch_subslot_filter_impl.h b/lib/flow_control/burst_sdcch_subslot_filter_impl.h
index 05038d7..0f2bbe3 100644
--- a/lib/flow_control/burst_sdcch_subslot_filter_impl.h
+++ b/lib/flow_control/burst_sdcch_subslot_filter_impl.h
@@ -33,14 +33,8 @@ namespace gr {
      private:
       // hardcoded subslots of the channels, both SDCCH and the associated SACCH
       // -1 means that the particular position in the frame is not SDCCH
-      const int8_t d_subslots_sdcch4[102] = {
-          -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
-          -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
-      };
-      const int8_t d_subslots_sdcch8[102] = {
-          0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
-          0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
-      };
+      const int8_t * const d_subslots_sdcch4;
+      const int8_t * const d_subslots_sdcch8;
       subslot_filter_mode d_mode;
       unsigned int d_subslot;
      public:
diff --git a/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc b/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc
index 260fe11..9774eaa 100644
--- a/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc
+++ b/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc
@@ -30,6 +30,15 @@
 #include <grgsm/endian.h>
 #include <grgsm/gsmtap.h>
 
+static const int8_t subslots_sdcch4[102] = {
+  -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
+  -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
+};
+static const int8_t subslots_sdcch8[102] = {
+  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
+  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
+};
+
 
 namespace gr {
   namespace gsm {
@@ -48,7 +57,9 @@ namespace gr {
       : gr::block("burst_sdcch_subslot_splitter",
               gr::io_signature::make(0, 0, 0),
               gr::io_signature::make(0, 0, 0)),
-      d_mode(mode)
+      d_mode(mode),
+      d_subslots_sdcch4(subslots_sdcch4),
+      d_subslots_sdcch8(subslots_sdcch8)
     {     
         message_port_register_in(pmt::mp("in"));
         
diff --git a/lib/flow_control/burst_sdcch_subslot_splitter_impl.h b/lib/flow_control/burst_sdcch_subslot_splitter_impl.h
index 58aff96..d68adce 100644
--- a/lib/flow_control/burst_sdcch_subslot_splitter_impl.h
+++ b/lib/flow_control/burst_sdcch_subslot_splitter_impl.h
@@ -33,14 +33,8 @@ namespace gr {
      private:
       // hardcoded subslots of the channels, both SDCCH and the associated SACCH
       // -1 means that the particular position in the frame is not SDCCH
-      const int8_t d_subslots_sdcch4[102] = {
-          -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
-          -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
-      };
-      const int8_t d_subslots_sdcch8[102] = {
-          0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
-          0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
-      };
+      const int8_t * const d_subslots_sdcch4;
+      const int8_t * const d_subslots_sdcch8;
       splitter_mode d_mode;
      public:
       burst_sdcch_subslot_splitter_impl(splitter_mode mode);