diff --git a/src/Makefile b/src/Makefile
index 6d8b1ef..6ea0730 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -35,6 +35,7 @@ NVCC_GENCODE ?= -gencode=arch=compute_35,code=sm_35 \
 endif
 
 NVCUFLAGS  := -ccbin $(CXX) $(NVCC_GENCODE) -std=c++11
+CXXFLAGS   := -std=c++11
 
 LDFLAGS    := -L${CUDA_LIB} -lcudart -lrt
 NVLDFLAGS  := -L${CUDA_LIB} -l${CUDARTLIB} -lrt