diff --git a/src/tiff/libtiff/tif_config.h b/src/tiff/libtiff/tif_config.h
index f85ecbe635..b0840c777f 100644
--- a/src/tiff/libtiff/tif_config.h
+++ b/src/tiff/libtiff/tif_config.h
@@ -32,7 +32,7 @@
 #define SIZEOF_LONG 4
 #endif
 
-#if __BIG_ENDIAN__
+#ifdef __BIG_ENDIAN__
     /* Set the native cpu bit order */
     #define HOST_FILLORDER FILLORDER_MSB2LSB