diff --git a/crypto/tinycrypt/CMakeLists.txt b/crypto/tinycrypt/CMakeLists.txt
index a44ed6234d3..c75ae88c640 100644
--- a/crypto/tinycrypt/CMakeLists.txt
+++ b/crypto/tinycrypt/CMakeLists.txt
@@ -64,6 +64,7 @@ if(CONFIG_TINYCRYPT)
   # Sources
   # ############################################################################
 
+  list(APPEND CFLAGS -Dunix)
   set(CSRCS
       ${TINYCRYPT_DIR}/lib/source/utils.c ${TINYCRYPT_DIR}/lib/source/ecc.c
       ${TINYCRYPT_DIR}/lib/source/ecc_platform_specific.c)
@@ -120,7 +121,7 @@ if(CONFIG_TINYCRYPT)
   if(CONFIG_TINYCRYPT_TEST)
     list(APPEND CSRCS ${TINYCRYPT_DIR}/tests/test_ecc_utils.c)
     list(APPEND INCDIR ${TINYCRYPT_DIR}/tests/include)
-    set(CFLAGS -Dhex2bin=ltp_hex2bin -DENABLE_TESTS)
+    list(APPEND CFLAGS -DENABLE_TESTS)
 
     nuttx_add_application(
       NAME
diff --git a/crypto/tinycrypt/Makefile b/crypto/tinycrypt/Makefile
index 6b3930a910c..70cee243530 100644
--- a/crypto/tinycrypt/Makefile
+++ b/crypto/tinycrypt/Makefile
@@ -48,6 +48,7 @@ distclean::
 	$(Q) rm -rf $(TINYCRYPT_UNPACKNAME)
 endif
 
+CFLAGS += ${DEFINE_PREFIX}unix
 CSRCS += tinycrypt/lib/source/utils.c
 
 ifeq ($(CONFIG_TINYCRYPT_ECC),y)
@@ -105,8 +106,7 @@ endif
 
 ifeq ($(CONFIG_TINYCRYPT_TEST),y)
 	CFLAGS    += ${INCDIR_PREFIX}$(APPDIR)/crypto/tinycrypt/tinycrypt/tests/include
-	CFLAGS    +=-Dhex2bin=ltp_hex2bin
-	CFLAGS    +=-DENABLE_TESTS
+	CFLAGS    += -DENABLE_TESTS
 	CSRCS     += tinycrypt/tests/test_ecc_utils.c
 	PRIORITY   = $(CONFIG_TINYCRYPT_TEST_PRIORITY)
 	STACKSIZE  = $(CONFIG_TINYCRYPT_TEST_STACKSIZE)