diff --git a/ncompress.spec b/ncompress.spec
index 564da85..d5dad1f 100644
--- a/ncompress.spec
+++ b/ncompress.spec
@@ -1,7 +1,7 @@
 Summary: Fast compression and decompression utilities.
 Name: ncompress
 Version: 4.2.4
-Release: 21
+Release: 21a
 License: distributable
 Group: Applications/File
 Source: ftp://metalab.unc.edu/pub/Linux/utils/compress/ncompress-4.2.4.tar.Z
@@ -29,7 +29,7 @@ which are compatible with the original UNIX compress utility.
 make "RPM_OPT_FLAGS=$RPM_OPT_FLAGS" ENDIAN=4321
 %endif
 
-%ifarch sparc m68k armv4l ppc s390
+%ifarch sparc m68k armv4l ppc s390 s390x
 make "RPM_OPT_FLAGS=$RPM_OPT_FLAGS" ENDIAN=1234
 %endif