diff --git a/qt6-qtshadertools.spec b/qt6-qtshadertools.spec
index f0d8b2b..b9694cf 100644
--- a/qt6-qtshadertools.spec
+++ b/qt6-qtshadertools.spec
@@ -1,3 +1,7 @@
+# FIXME: qt6-qtdeclarative doesn't build on S390x
+# BUG: https://bugreports.qt.io/browse/QTBUG-93101
+ExcludeArch: s390x
+
 %global qt_module qtshadertools
 
 %global unstable 1