diff --git a/openucx-s390x-support.patch b/openucx-s390x-support.patch
index fa22dc6..428b948 100644
--- a/openucx-s390x-support.patch
+++ b/openucx-s390x-support.patch
@@ -244,7 +244,7 @@ index 000000000000..ce48ff1ff451
 +{
 +	if (!n)
 +		return 0;
-+	return 63 - __builtin_clz(n);
++	return 63 - __builtin_clzl(n);
 +}
 +
 +static UCS_F_ALWAYS_INLINE unsigned ucs_ffs32(uint32_t n)
diff --git a/openucx.changes b/openucx.changes
index cfd14d0..a2ccdb7 100644
--- a/openucx.changes
+++ b/openucx.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Jan 16 09:45:05 UTC 2023 - Andreas Schwab <schwab@suse.de>
+
+- openucx-s390x-support.patch: fix use of clz builtin for 64-bit value
+
 -------------------------------------------------------------------
 Tue Oct  4 16:39:30 UTC 2022 - Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
 
diff --git a/openucx.spec b/openucx.spec
index 17e80ba..cb014d2 100644
--- a/openucx.spec
+++ b/openucx.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package openucx
 #
-# Copyright (c) 2022 SUSE LLC
+# Copyright (c) 2023 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed