diff --git a/main.c b/main.c
index f5322b5..3bfe1e4 100644
--- a/main.c
+++ b/main.c
@@ -344,23 +344,26 @@ static void decompress_file(void)
 		fd_out = open_tmpoutfile();
 	control.fd_out = fd_out;
 
-	/* Check if there's enough free space on the device chosen to fit the
-	 * decompressed file. */
-	if (unlikely(fstatvfs(fd_out, &fbuf)))
-		fatal("Failed to fstatvfs in decompress_file\n");
-	free_space = fbuf.f_bsize * fbuf.f_bavail;
-	if (free_space < expected_size) {
-		if (FORCE_REPLACE)
-			print_err("Warning, inadequate free space detected, but attempting to decompress due to -f option being used.\n");
-		else
-			failure("Inadequate free space to decompress file, use -f to override.\n");
+	read_magic(fd_in, &expected_size);
+
+	if (!STDOUT) {
+		/* Check if there's enough free space on the device chosen to fit the
+		* decompressed file. */
+		if (unlikely(fstatvfs(fd_out, &fbuf)))
+			fatal("Failed to fstatvfs in decompress_file\n");
+		free_space = fbuf.f_bsize * fbuf.f_bavail;
+		if (free_space < expected_size) {
+			if (FORCE_REPLACE)
+				print_err("Warning, inadequate free space detected, but attempting to decompress due to -f option being used.\n");
+			else
+				failure("Inadequate free space to decompress file, use -f to override.\n");
+		}
 	}
 
 	fd_hist = open(control.outfile, O_RDONLY);
 	if (unlikely(fd_hist == -1))
 		fatal("Failed to open history file %s\n", control.outfile);
 
-	read_magic(fd_in, &expected_size);
 	if (NO_MD5)
 		print_verbose("Not performing MD5 hash check\n");
 	if (HAS_MD5)