diff --git a/code/makefile b/code/makefile
index 88be28f..143bdfa 100644
--- a/code/makefile
+++ b/code/makefile
@@ -4,6 +4,10 @@ ifdef CHECK
 flags += -fcheck=all
 endif
 
+ifdef DEBUG
+flags += -g
+endif
+
 compiler = gfortran
 
 ex  : test.o ysolve.o Compact.o