diff --git a/src/make.inc b/src/make.inc
index b1536f109980dc5c18dd1462b714bbaba035df0a..c56fd1334e83be3d50ed2363a3ccfc8d2df375b2 100644
--- a/src/make.inc
+++ b/src/make.inc
@@ -40,7 +40,7 @@ endif
 
 # CXXFLAGS defines the default compilation options for the C++ compiler
 ifndef CXXFLAGS
-#override CXXFLAGS=-O3 -ggdb -pg -coverage -I$(HDF5_INCLUDE)
+#override CXXFLAGS=-O0 -ggdb -pg -coverage -I$(HDF5_INCLUDE)
 override CXXFLAGS=-O3 -I$(HDF5_INCLUDE)
 endif