diff --git a/tune/Makefile.am b/tune/Makefile.am
index bac3223b..b8b34514 100644
--- a/tune/Makefile.am
+++ b/tune/Makefile.am
@@ -23,7 +23,7 @@
 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/tests
 
 EXTRA_DIST = alpha.asm pentium.asm sparcv9.asm hppa.asm hppa2.asm hppa2w.asm \
-  ia64.asm powerpc.asm powerpc64.asm x86_64.s many.pl
+  ia64.asm powerpc.asm powerpc64.asm x86_64.asm many.pl
 noinst_HEADERS = speed.h
 
 # Prefer -static on the speed and tune programs, since that can avoid
diff --git a/tune/Makefile.in b/tune/Makefile.in
index 206e7a20..c326aabb 100644
--- a/tune/Makefile.in
+++ b/tune/Makefile.in
@@ -293,7 +293,7 @@ sysconfdir = @sysconfdir@
 target_alias = @target_alias@
 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/tests
 EXTRA_DIST = alpha.asm pentium.asm sparcv9.asm hppa.asm hppa2.asm hppa2w.asm \
-  ia64.asm powerpc.asm powerpc64.asm x86_64.s many.pl
+  ia64.asm powerpc.asm powerpc64.asm x86_64.as many.pl
 
 noinst_HEADERS = speed.h
 @ENABLE_STATIC_FALSE@STATIC =