diff --git a/libguile/ChangeLog b/libguile/ChangeLog
index d059dccf2..735312da8 100644
--- a/libguile/ChangeLog
+++ b/libguile/ChangeLog
@@ -1,3 +1,8 @@
+2003-04-20  Dirk Herrmann  <D.Herrmann@tu-bs.de>
+
+	* numbers.c (scm_logtest):  Fixed argument bug in the call to
+	mpz_and, which showed up when compiling with SCM_DEBUG defined.
+
 2003-04-20  Dirk Herrmann  <D.Herrmann@tu-bs.de>
 
 	* gc-card.c (scm_i_sweep_card, scm_i_init_card_freelist): Fixed
diff --git a/libguile/numbers.c b/libguile/numbers.c
index f54038721..8f89ecc2c 100644
--- a/libguile/numbers.c
+++ b/libguile/numbers.c
@@ -1073,7 +1073,7 @@ SCM_DEFINE (scm_logtest, "logtest", 2, 0, 0,
       SCM result;
       mpz_t result_z;
       mpz_init (result_z);
-      mpz_and (SCM_I_BIG_MPZ (result_z),
+      mpz_and (result_z,
                SCM_I_BIG_MPZ (j),
                SCM_I_BIG_MPZ (k));
       scm_remember_upto_here_2 (j, k);