diff --git a/lrzip.c b/lrzip.c
index be4b2eb..d99ed44 100644
--- a/lrzip.c
+++ b/lrzip.c
@@ -452,6 +452,14 @@ void clear_tmpinbuf(rzip_control *control)
 	control->in_len = control->in_ofs = 0;
 }
 
+void clear_tmpinfile(rzip_control *control)
+{
+	if (unlikely(lseek(control->fd_in, 0, SEEK_SET)))
+		fatal("Failed to lseek on fd_in in clear_tmpinfile\n");
+	if (unlikely(ftruncate(control->fd_in, 0)))
+		fatal("Failed to truncate fd_in in clear_tmpinfile\n");
+}
+
 void close_tmpinbuf(rzip_control *control)
 {
 	control->flags &= ~FLAG_TMP_INBUF;
diff --git a/lrzip.h b/lrzip.h
index a4977aa..e01190c 100644
--- a/lrzip.h
+++ b/lrzip.h
@@ -37,5 +37,6 @@ void write_fdout(rzip_control *control, void *buf, i64 len);
 void flush_tmpoutbuf(rzip_control *control);
 void close_tmpoutbuf(rzip_control *control);
 void clear_tmpinbuf(rzip_control *control);
+void clear_tmpinfile(rzip_control *control);
 void close_tmpinbuf(rzip_control *control);
 #endif
diff --git a/runzip.c b/runzip.c
index 808e0d4..e2d3417 100644
--- a/runzip.c
+++ b/runzip.c
@@ -327,6 +327,8 @@ i64 runzip_fd(rzip_control *control, int fd_in, int fd_out, int fd_hist, i64 exp
 			dump_tmpoutfile(control, fd_out);
 		if (TMP_INBUF)
 			clear_tmpinbuf(control);
+		else if (STDIN)
+			clear_tmpinfile(control);
 	} while (total < expected_size || (!expected_size && !control->eof));
 
 	gettimeofday(&end,NULL);