diff --git a/Makefile b/Makefile
index e453519..c235a3b 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ HDRS := $(wildcard src/*.hpp)
 
 CXX ?= g++
 
-CXXFLAGS := $(CXXFLAGS) -Wshadow -Wall -Wpedantic -Wextra -g -fno-strict-aliasing -std=c++17 -fPIC
+CXXFLAGS += -Wshadow -Wall -Wpedantic -Wextra -g -std=c++17 -fPIC
 ifeq ($(DEBUG),1)
 	CXXFLAGS += -D DEBUG -O0
 	CONFIG := debug
diff --git a/tests/Makefile b/tests/Makefile
index ae065a3..7e524f5 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -14,7 +14,7 @@ CXX ?= g++
 RM := /bin/rm -rf
 INSTALL := /usr/bin/install -c
 
-CXXFLAGS := $(CXXFLAGS) -Wshadow -Wall -Wpedantic -Wextra -g -fno-strict-aliasing -std=c++17 -pthread -I../src
+CXXFLAGS += -Wshadow -Wall -Wpedantic -Wextra -g -std=c++17 -I../src
 ifeq ($(DEBUG),1)
 	CXXFLAGS += -D DEBUG -O0
 	CONFIG := debug