diff --git a/src/MakeLib.mk b/src/MakeLib.mk
index 96ba694..513096e 100644
--- a/src/MakeLib.mk
+++ b/src/MakeLib.mk
@@ -10,7 +10,7 @@ all: $(LIBNAME) libnethogs.a
 
 UNAME_S := $(shell uname -s)
 ifeq ($(UNAME_S),Linux)
-  LDFLAGS:= -shared -Wl,-soname,$(SO_NAME)
+  LDFLAGS:= -shared -Wl,-soname,$(SO_NAME) -Wl,-z,now -Wl,-z,relro
 else ifeq ($(UNAME_S),FreeBSD)
   LDFLAGS:= -shared -Wl,-soname,$(SO_NAME)
 else
@@ -97,11 +97,11 @@ $(ODIR)/conninode.o: conninode.cpp nethogs.h conninode.h
 
 $(ODIR)/devices.o: devices.cpp devices.h
 	@mkdir -p $(ODIR)
-	$(CXX) $(CXXFLAGS) -o $@ -c devices.cpp
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ -c devices.cpp
 
 $(ODIR)/libnethogs.o: libnethogs.cpp libnethogs.h
 	@mkdir -p $(ODIR)
-	$(CXX) $(CXXFLAGS) -o $@ -c libnethogs.cpp -DVERSION=\"$(LIBVERSION)\"
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ -c libnethogs.cpp -DVERSION=\"$(LIBVERSION)\"
 
 .PHONY: clean
 clean: