diff --git a/llvm.spec b/llvm.spec
index 30330b8..f73cfc8 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -207,7 +207,13 @@ LLVM's modified googletest sources.
 	utils/update_cc_test_checks.py
 
 %build
+
+%ifarch s390 s390x
+# Fails with "exceeded PCRE's backtracking limit"
+%global _lto_cflags %nil
+%else
 %global _lto_cflags -flto=thin
+%endif
 
 %ifarch s390 s390x %{arm} %ix86
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking