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diff --git a/Makefile b/Makefile
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index 9b6a46e..df5a817 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -207,18 +207,18 @@ else ifeq (amd64,$(shell uname -m))
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 else ifeq (aarch64,$(shell uname -m))
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   BITS := 64
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   SSE_FLAG :=
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-  CXXFLAGS := -fopenmp-simd
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-  CPPFLAGS := -Ithird_party/simde
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+  CXXFLAGS += -fopenmp-simd
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+  CPPFLAGS += -Ithird_party/simde
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 else ifeq (s390x,$(shell uname -m))
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   BITS := 64
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   SSE_FLAG :=
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-  CXXFLAGS := -fopenmp-simd
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-  CPPFLAGS := -Ithird_party/simde
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+  CXXFLAGS += -fopenmp-simd
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+  CPPFLAGS += -Ithird_party/simde
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   SANITIZER_FLAGS :=
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 else ifeq (ppc64le,$(shell uname -m))
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   BITS := 64
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   SSE_FLAG :=
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-  CXXFLAGS := -fopenmp-simd
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+  CXXFLAGS += -fopenmp-simd
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   CPPFLAGS += -Ithird_party/simde
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   SANITIZER_FLAGS :=
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 endif
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-- 
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2.25.4
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