diff --git a/pkg/cryptoauthlib/Makefile b/pkg/cryptoauthlib/Makefile
index dc05d046c2..aad2317be0 100644
--- a/pkg/cryptoauthlib/Makefile
+++ b/pkg/cryptoauthlib/Makefile
@@ -11,9 +11,11 @@ include $(RIOTBASE)/pkg/pkg.mk
 
 CMAKE_MINIMAL_VERSION = 3.6.0
 
+CFLAGS += $(INCLUDES)
 CFLAGS += -Wno-missing-field-initializers -Wno-unused-function
 CFLAGS += -Wno-type-limits -Wno-strict-aliasing -Wno-unused-variable -DATCA_HAL_I2C
 CFLAGS += -Wno-unused-parameter -Wno-sign-compare -Wno-overflow -Wno-pointer-to-int-cast
+CFLAGS += -Wno-char-subscripts
 
 TOOLCHAIN_FILE=$(PKG_BUILDDIR)/xcompile-toolchain.cmake
 
diff --git a/pkg/cryptoauthlib/Makefile.include b/pkg/cryptoauthlib/Makefile.include
index d7bc7be062..3baf726f79 100644
--- a/pkg/cryptoauthlib/Makefile.include
+++ b/pkg/cryptoauthlib/Makefile.include
@@ -14,7 +14,3 @@ ifneq (,$(filter cryptoauthlib_test,$(USEMODULE)))
   INCLUDES += -I$(PKG_TESTINCLDIR)/tng
   INCLUDES += -I$(PKG_TESTINCLDIR)/atcacert
 endif
-
-ifneq (,$(filter cortex-m%,$(CPU_ARCH)))
-  TOOLCHAINS_BLACKLIST += llvm
-endif