diff --git a/build/hosts/default b/build/hosts/default
index 4edcdce..d45ac18 100644
--- a/build/hosts/default
+++ b/build/hosts/default
@@ -55,7 +55,7 @@ LD        = $(FC)
 # compiler and linker flags
 #
 ifeq ($(DEBUG),Y)
-FFLAGS    = -O -g -DDEBUG
+FFLAGS    = -O0 -g -Mbounds -Mchkptr -Mcache_align -Mnovintr -Mchkstk -DDEBUG
 else
 FFLAGS    = -fast -O3
 endif