diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
index 140be6086..1496cc411 100644
--- a/src/Makefile_obj.in
+++ b/src/Makefile_obj.in
@@ -79,7 +79,7 @@ ifeq ($(VL_NOOPT),1)
 CPPFLAGS += -O0
 else ifeq ($(VL_DEBUG),)
 # Optimize
-CPPFLAGS += -O2
+CPPFLAGS += -O3
 else
 # Debug
 CPPFLAGS += @CFG_CXXFLAGS_DEBUG@ -DVL_DEBUG -D_GLIBCXX_DEBUG