diff --git a/libowlps/owlps.h b/libowlps/owlps.h
index d277f54..70f4cf9 100644
--- a/libowlps/owlps.h
+++ b/libowlps/owlps.h
@@ -285,6 +285,8 @@ float owl_swap_float(const float f) ;
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 #  define owl_htonf(f) owl_swap_float(f)
 #  define owl_ntohf(f) owl_swap_float(f)
+# else // __BYTE_ORDER == __LITTLE_ENDIAN
+#  error "This program does not handle strange architectures."
 # endif // __BYTE_ORDER == __LITTLE_ENDIAN
 #endif // __BYTE_ORDER == __BIG_ENDIAN