diff --git a/libguile/numbers.h b/libguile/numbers.h
index 16f72b4c4..46f70e288 100644
--- a/libguile/numbers.h
+++ b/libguile/numbers.h
@@ -46,6 +46,8 @@
 
 #include "libguile/__scm.h"
 
+#include "libguile/print.h"
+
 
 
 
@@ -170,6 +172,9 @@
 # define SCM_LONGLONGBIGUP(x) ((ulong_long)(x) << SCM_BITSPERDIG)
 # define SCM_BIGDN(x) ((x) >> SCM_BITSPERDIG)
 # define SCM_BIGLO(x) ((x) & (SCM_BIGRAD-1))
+
+extern char scm_s_bignum[];
+
 #endif /* def BIGNUMS */
 
 #ifndef SCM_BIGDIG