diff --git a/Makefile b/Makefile
index 62bba1bb2..6cae6639f 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@
 HAVE_RULES = yes
 
 ifndef CXXFLAGS
-    CXXFLAGS=-Wall -Wextra -Wshadow -pedantic -Wno-long-long -Wfloat-equal -Wcast-qual -g
+    CXXFLAGS=-O2 -DNDEBUG -Wall
 endif
 
 ifeq ($(HAVE_RULES),yes)