diff --git a/makefile_linux b/makefile_linux
index 5ad473e..056eb20 100644
--- a/makefile_linux
+++ b/makefile_linux
@@ -12,7 +12,7 @@ include ../sllinux_def
 CC       = gcc
 CFLAGS = -I$(HDFROOT)/include -DHDF4  -DHDF5 $(NI) -Ihardsup \
        -I..  -DCYGNUS -DNONINTF -g  $(DFORTIFY)  \
-       -Wall -Wno-unused -Wno-comment -Wno-switch -Werror
+       -Wall -Wno-unused -Wunused-value -Wno-comment -Wno-switch -Werror
 
 EXTRA=nintf.o