diff --git a/sys-libs/glibc/glibc-2.42-r2.ebuild b/sys-libs/glibc/glibc-2.42-r2.ebuild
index 25498b338615b..3d1194e0e022a 100644
--- a/sys-libs/glibc/glibc-2.42-r2.ebuild
+++ b/sys-libs/glibc/glibc-2.42-r2.ebuild
@@ -295,7 +295,7 @@ do_run_test() {
 
 	if [[ ${MERGE_TYPE} == "binary" ]] ; then
 		# ignore build failures when installing a binary package #324685
-		do_compile_test "" "$@" 2>/dev/null || return 0
+		CFLAGS="-O2" LDFLAGS="" do_compile_test "" "$@" 2>/dev/null || return 0
 	else
 		ebegin "Performing simple compile test for ABI=${ABI}"
 		if ! do_compile_test "" "$@" ; then
diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index af95e206646ed..095b33bd38e50 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -295,7 +295,7 @@ do_run_test() {
 
 	if [[ ${MERGE_TYPE} == "binary" ]] ; then
 		# ignore build failures when installing a binary package #324685
-		do_compile_test "" "$@" 2>/dev/null || return 0
+		CFLAGS="-O2" LDFLAGS="" do_compile_test "" "$@" 2>/dev/null || return 0
 	else
 		ebegin "Performing simple compile test for ABI=${ABI}"
 		if ! do_compile_test "" "$@" ; then