diff --git a/gr-digital/lib/digital_correlate_access_code_bb.cc b/gr-digital/lib/digital_correlate_access_code_bb.cc
index f21b57d..79c7639 100644
--- a/gr-digital/lib/digital_correlate_access_code_bb.cc
+++ b/gr-digital/lib/digital_correlate_access_code_bb.cc
@@ -78,7 +78,20 @@ digital_correlate_access_code_bb::set_access_code(
   for (unsigned i=0; i < 64; i++){
     d_access_code <<= 1;
     if (i < len)
-      d_access_code |= access_code[i] & 1;	// look at LSB only
+    {
+      if (access_code[i] == '1')
+      {
+		  d_access_code |= 1;
+	  }
+	  else if (access_code[i] == '0')
+	  {
+		  d_access_code |= 0;
+	  }
+	  else
+	  {
+		  return false;
+	  }
+    }
   }
 
   return true;