diff --git a/makefile_linux b/makefile_linux
index 1c00e31..8c3f32f 100644
--- a/makefile_linux
+++ b/makefile_linux
@@ -12,7 +12,7 @@ include ../linux_def
 CC       = gcc
 CFLAGS = -I$(HDFROOT)/include -DHDF4  -DHDF5 $(NI) -Ihardsup \
        -I.. -fwritable-strings -DCYGNUS -DNONINTF -g $(DFORTIFY) \
-       -Wall -Wno-unused -Wno-comment -Wno-switch 
+       -Wall -Wno-unused -Wno-comment -Wno-switch -Werror
 
 EXTRA=nintf.o