diff --git a/Makefile b/Makefile
index 7c686b1e2..cda25812f 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ else # !COMSPEC
 endif # COMSPEC
 
 ifndef CXXFLAGS
-    CXXFLAGS=-pedantic -Wall -Wextra -Wabi -Wcast-qual -Wconversion -Wfloat-equal -Winline -Wmissing-declarations -Wmissing-format-attribute -Wno-long-long -Woverloaded-virtual -Wpacked -Wredundant-decls -Wshadow -Wsign-promo $(CPPCHK_GLIBCXX_DEBUG) -g
+    CXXFLAGS=-O2 -DNDEBUG -Wall
 endif
 
 ifeq ($(HAVE_RULES),yes)
@@ -256,7 +256,7 @@ lib/checknullpointer.o: lib/checknullpointer.cpp lib/checknullpointer.h lib/conf
 lib/checkobsoletefunctions.o: lib/checkobsoletefunctions.cpp lib/checkobsoletefunctions.h lib/config.h lib/check.h lib/token.h lib/tokenize.h lib/errorlogger.h lib/suppressions.h lib/tokenlist.h lib/settings.h lib/standards.h lib/symboldatabase.h lib/mathlib.h
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) ${INCLUDE_FOR_LIB} -c -o lib/checkobsoletefunctions.o lib/checkobsoletefunctions.cpp
 
-lib/checkother.o: lib/checkother.cpp lib/checkother.h lib/config.h lib/check.h lib/token.h lib/tokenize.h lib/errorlogger.h lib/suppressions.h lib/tokenlist.h lib/settings.h lib/standards.h lib/checknullpointer.h lib/mathlib.h lib/symboldatabase.h
+lib/checkother.o: lib/checkother.cpp lib/checkother.h lib/config.h lib/check.h lib/token.h lib/tokenize.h lib/errorlogger.h lib/suppressions.h lib/tokenlist.h lib/settings.h lib/standards.h lib/mathlib.h lib/symboldatabase.h
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) ${INCLUDE_FOR_LIB} -c -o lib/checkother.o lib/checkother.cpp
 
 lib/checkpostfixoperator.o: lib/checkpostfixoperator.cpp lib/checkpostfixoperator.h lib/config.h lib/check.h lib/token.h lib/tokenize.h lib/errorlogger.h lib/suppressions.h lib/tokenlist.h lib/settings.h lib/standards.h lib/symboldatabase.h lib/mathlib.h