diff --git a/libkdumpfile.spec b/libkdumpfile.spec
index f906c22..e8d5424 100644
--- a/libkdumpfile.spec
+++ b/libkdumpfile.spec
@@ -73,8 +73,12 @@ The %{name}-devel package contains misc utilities built with %{name}.
 %prep
 %autosetup -p1
 %if %{without all_tests}
+%ifnarch x86_64
+# patch disabling union of tests failing on other arches
 cat %{SOURCE1} | patch -p1
+%endif
 %ifarch %{ix86}
+# this test errors out only on 32-bit x86
 cat %{SOURCE2} | patch -p1
 %endif
 %endif