diff --git a/guile/mu-guile.c b/guile/mu-guile.c
index 9d9d92d3..78ae82a3 100644
--- a/guile/mu-guile.c
+++ b/guile/mu-guile.c
@@ -556,7 +556,7 @@ SCM_DEFINE_PUBLIC (mu_initialize, "mu:initialize", 0, 1, 0,
 	/* cleanup when we're exiting */
 	g_atexit (uninit_mu);
 
-	return SCM_BOOL_T;
+	return SCM_UNSPECIFIED;
 }
 #undef FUNC_NAME
 
diff --git a/guile/mu.scm b/guile/mu.scm
index 8884be93..5658ceb7 100644
--- a/guile/mu.scm
+++ b/guile/mu.scm
@@ -119,3 +119,4 @@ argument, and returns some number. For example, to get the average message size
   (if (= count 0)
     0
     (exact->inexact (/ sum count)))))
+