diff --git a/Makefile.conf b/Makefile.conf
index 8a29b41..3490afa 100644
--- a/Makefile.conf
+++ b/Makefile.conf
@@ -63,7 +63,7 @@ endif
 ### Debug or Release build
 ifeq ($(DEBUG),1)
     $(info Debug build (set DEBUG=0 for release build))
-    CXXFLAGS+=-g
+    CXXFLAGS+=-g -O3
 else
     $(info Release Build (set DEBUG=1 for debug build))
     CXXFLAGS+=-DNDEBUG=1 -O3