diff --git a/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk b/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk
index 0a43f46e..b7c661a1 100644
--- a/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk
+++ b/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk
@@ -2,6 +2,7 @@
 WOLF_SSL_FLAGS =	-DSINGLE_THREADED	\
 			-DNO_WOLFSSL_CLIENT	\
 			-DNO_WOLFSSL_SERVER	\
+			-DWOLFCRYPT_ONLY	\
 			-DOPENSSL_EXTRA		\
 			-DNO_FILESYSTEM		\
 			-DWOLFSSL_USER_SETTINGS	\
diff --git a/external/wolfssl b/external/wolfssl
index 9c87f979..decea12e 160000
--- a/external/wolfssl
+++ b/external/wolfssl
@@ -1 +1 @@
-Subproject commit 9c87f979a7f1d3a6d786b260653d566c1d31a1c4
+Subproject commit decea12e223869c8f8f3ab5a53dc90b69f436eb2