diff --git a/core/arch/arm/pta/sub.mk b/core/arch/arm/pta/sub.mk
index 8f9451b60be..a63518e29b6 100644
--- a/core/arch/arm/pta/sub.mk
+++ b/core/arch/arm/pta/sub.mk
@@ -1,6 +1,7 @@
 ifeq (y,$(CFG_TEE_CORE_EMBED_INTERNAL_TESTS))
 srcs-y += pta_invoke_tests.c
 srcs-y += core_self_tests.c
+cflags-core_self_tests.c-y += -fno-builtin
 srcs-y += interrupt_tests.c
 srcs-y += core_mutex_tests.c
 srcs-$(CFG_WITH_USER_TA) += core_fs_htree_tests.c