diff --git a/base/glibc/glibc.conf b/base/glibc/glibc.conf
index 902bc8bfa..03800b6f6 100644
--- a/base/glibc/glibc.conf
+++ b/base/glibc/glibc.conf
@@ -67,6 +67,15 @@ if [ $SDECFG_PKG_GLIBC_TLS = 1 ]; then
 		# tls config.cache tweaks for toolchain stage
 		if atstage toolchain ; then
 			case "$arch" in
+				powerpc64)
+					tls_arch=powerpc64
+					var_append configcache ' ' \
+						"libc_cv_ppc_machine=yes"
+					var_append configcache ' ' \
+						"libc_cv_mlong_double_128ibm=yes"
+					var_append configcache ' ' \
+						"libc_cv_mlong_double_128=yes"
+					;;
 				sparc64)
 					tls_arch=sparc64
 					;;