diff --git a/babl.spec b/babl.spec
index 479e52f..0138a4d 100644
--- a/babl.spec
+++ b/babl.spec
@@ -1,9 +1,13 @@
 # skip tests known to be problematic in a specific version
-%global skip_checks_version 0.1.50
+%global skip_checks_version 0.1.52
 %ifarch ppc64 ppc64le
-%global skip_checks chromaticities srgb_to_lab_u8 models float-to-8bit
-%else
 %global skip_checks %nil
+%else
+  %ifarch s390x
+  %global skip_checks float-to-8bit
+  %else
+  %global skip_checks %nil
+  %endif
 %endif
 
 %if ! 0%{?fedora}%{?rhel} || 0%{?fedora} >= 20 || 0%{?rhel} > 7