diff --git a/squid-5.1-test-store-cppsuite.patch b/squid-5.1-test-store-cppsuite.patch
new file mode 100644
index 0000000..d7c52be
--- /dev/null
+++ b/squid-5.1-test-store-cppsuite.patch
@@ -0,0 +1,24 @@
+diff --git a/src/tests/testStoreHashIndex.cc b/src/tests/testStoreHashIndex.cc
+index 0564380..fcd60b9 100644
+--- a/src/tests/testStoreHashIndex.cc
++++ b/src/tests/testStoreHashIndex.cc
+@@ -102,6 +102,8 @@ void commonInit()
+     if (inited)
+         return;
+ 
++    inited = true;
++
+     Mem::Init();
+ 
+     Config.Store.avgObjectSize = 1024;
+@@ -109,6 +111,10 @@ void commonInit()
+     Config.Store.objectsPerBucket = 20;
+ 
+     Config.Store.maxObjectSize = 2048;
++
++    Config.memShared.defaultTo(false);
++
++    Config.store_dir_select_algorithm = xstrdup("round-robin");
+ }
+ 
+ /* TODO make this a cbdata class */
diff --git a/squid.spec b/squid.spec
index 511c675..a27b277 100644
--- a/squid.spec
+++ b/squid.spec
@@ -2,7 +2,7 @@
 
 Name:     squid
 Version:  5.1
-Release:  2%{?dist}
+Release:  3%{?dist}
 Summary:  The Squid proxy caching server
 Epoch:    7
 # See CREDITS for breakdown of non GPLv2+ code
@@ -39,6 +39,8 @@ Patch205: squid-5.0.5-symlink-lang-err.patch
 Patch206: squid-5.0.6-openssl3.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=1969322
 Patch207: squid-5.0.6-active-ftp.patch
+# https://bugzilla.redhat.com/show_bug.cgi?id=1988122
+Patch208: squid-5.1-test-store-cppsuite.patch
 
 # cache_swap.sh
 Requires: bash gawk
@@ -111,15 +113,14 @@ lookup program (dnsserver), a program for retrieving FTP data
 %patch205 -p1 -R -b .symlink-lang-err
 %patch206 -p1 -b .openssl3
 %patch207 -p1 -b .active-ftp
+%patch208 -p1 -b .test-store-cpp
+
 
 # https://bugzilla.redhat.com/show_bug.cgi?id=1679526
 # Patch in the vendor documentation and used different location for documentation
 sed -i 's|@SYSCONFDIR@/squid.conf.documented|%{_pkgdocdir}/squid.conf.documented|' src/squid.8.in
 
 %build
-# This package fails its testsuite when LTO is enabled.  This needs further
-# investigation
-%define _lto_cflags %{nil}
 
 # NIS helper has been removed because of the following bug
 # https://bugzilla.redhat.com/show_bug.cgi?id=1531540
@@ -345,6 +346,9 @@ fi
 
 
 %changelog
+* Wed Sep 15 2021 Luboš Uhliarik <luhliari@redhat.com> - 7:5.1-3
+- Resolves: #1988122 - Enable LTO build of squid for RHEL 9
+
 * Tue Aug 10 2021 Mohan Boddu <mboddu@redhat.com> - 7:5.1-2
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688