diff --git a/gztool.c b/gztool.c
index dd3b16c..4021cdd 100644
--- a/gztool.c
+++ b/gztool.c
@@ -142,7 +142,6 @@
 #include <sys/stat.h> // stat()
 #include <math.h>   // pow()
 #include <stdbool.h>// bool, false, true
-#include <sys/ioctl.h>// ioctl()
 
 // sets binary mode for stdin in Windows
 #define STDIN 0
@@ -2403,36 +2402,9 @@ local struct returned_output decompress_and_build_index(
         // note that here strm.avail_in > 0 only if ret.error == Z_STREAM_END
         int strm_avail_in0 = strm.avail_in;
         if ( !feof( file_in ) ) { // on last block, strm.avail_in > 0 is possible with feof(file_in)==1 already!
-
-            if ( strlen( file_name ) == 0 ) { // read from STDIN:
-                                              // do not wait for the buffer to be complete (<=CHUNK), but read asap
-                int n = 0;
-                strm.avail_in = 0;
-
-                if ( ioctl(0, FIONREAD, &n) >= 0 && n > 0 ) {
-                    if ( ( CHUNK - strm_avail_in0 ) >= n ) {
-                        strm.avail_in = fread(input + strm_avail_in0, 1, n, file_in);
-                    } else {
-                        strm.avail_in = fread(input + strm_avail_in0, 1, CHUNK - strm_avail_in0, file_in);
-                    }
-                } else {
-                    // sometimes ioctl() on STDIN doesn't immediatly return data there on &n ...
-                    if ( EXTRACT_TAIL == indx_n_extraction_opts ) { // (this is the more affected option,
-                                                                    // as it doesn't loop here again)
-                        // so make usual fread() until complete the whole chunk size:
-                        // (a while(ioctl()) loop here, waiting for input is not feasible, as window2 (code is executed)
-                        // later, and an (infinite) waiting loop here would prevent its output for being printed)
-                        strm.avail_in = fread(input + strm_avail_in0, 1, CHUNK - strm_avail_in0, file_in);
-                    }
-                }
-
-            } else {                         // read from file
-                strm.avail_in = fread(input + strm_avail_in0, 1, CHUNK - strm_avail_in0, file_in);
-            }
-
+            strm.avail_in = fread(input + strm_avail_in0, 1, CHUNK - strm_avail_in0, file_in);
             printToStderr( VERBOSITY_MANIAC, "[read %d B]", strm.avail_in );
             strm.avail_in += strm_avail_in0;
-
         }
         if ( feof( file_in ) ) {
             // generic check for growing files (not related to bgzip-compatible-streams code):