diff --git a/tftf/tests/tests-realm-payload.mk b/tftf/tests/tests-realm-payload.mk
index 36fcd56..add6a7f 100644
--- a/tftf/tests/tests-realm-payload.mk
+++ b/tftf/tests/tests-realm-payload.mk
@@ -64,7 +64,7 @@
 		pcie_doe.c	\
 	)
 
-ifeq (${ENABLE_REALM_PAYLOAD_TEST},1)
+ifeq (${ENABLE_REALM_PAYLOAD_TESTS},1)
 include lib/ext_mbedtls/mbedtls.mk
 endif
 endif