diff --git a/unittests/Makefile b/unittests/Makefile
index 4dbde55f10..f25a56fc44 100644
--- a/unittests/Makefile
+++ b/unittests/Makefile
@@ -1,5 +1,5 @@
 
-CC=g++
+CC=$(CXX)
 CFLAGS=-I. -I../src/modules -I ../src/include -I../src/drivers \
 	-I../src -I../src/lib -D__EXPORT="" -Dnullptr="0" -lm -std=c++11