diff --git a/dbus/dbus-marshal-basic.c b/dbus/dbus-marshal-basic.c
index 855c8691..6d0abac4 100644
--- a/dbus/dbus-marshal-basic.c
+++ b/dbus/dbus-marshal-basic.c
@@ -706,7 +706,7 @@ marshal_len_followed_by_bytes (int                  marshal_as,
   else
     value_len = data_len + 1; /* value has a nul */
 
-  _dbus_string_init_const_len (&value_str, value, value_len);
+  _dbus_string_init_const_len (&value_str, (const char *) value, value_len);
 
   pos = insert_at;
 
@@ -865,7 +865,7 @@ marshal_1_octets_array (DBusString          *str,
   int pos;
   DBusString value_str;
 
-  _dbus_string_init_const_len (&value_str, value, n_elements);
+  _dbus_string_init_const_len (&value_str, (const char *) value, n_elements);
 
   pos = insert_at;
 
@@ -982,7 +982,7 @@ marshal_fixed_multi (DBusString           *str,
     goto error;
 
   _dbus_string_init_const_len (&t,
-                               (const unsigned char*) value,
+                               (const char *) value,
                                len_in_bytes);
 
   if (!_dbus_string_copy (&t, 0,
diff --git a/dbus/dbus-marshal-byteswap.c b/dbus/dbus-marshal-byteswap.c
index 985108a4..43a4f477 100644
--- a/dbus/dbus-marshal-byteswap.c
+++ b/dbus/dbus-marshal-byteswap.c
@@ -161,7 +161,7 @@ byteswap_body_helper (DBusTypeReader       *reader,
             sig_len = *p;
             ++p;
 
-            _dbus_string_init_const_len (&sig, p, sig_len);
+            _dbus_string_init_const_len (&sig, (const char *) p, sig_len);
 
             p += (sig_len + 1); /* 1 for nul */
 
diff --git a/dbus/dbus-marshal-validate.c b/dbus/dbus-marshal-validate.c
index 9187a3e9..b1c1bdcf 100644
--- a/dbus/dbus-marshal-validate.c
+++ b/dbus/dbus-marshal-validate.c
@@ -420,7 +420,7 @@ validate_body_helper (DBusTypeReader       *reader,
             if (current_type == DBUS_TYPE_OBJECT_PATH)
               {
                 DBusString str;
-                _dbus_string_init_const_len (&str, p, claimed_len);
+                _dbus_string_init_const_len (&str, (const char *) p, claimed_len);
                 if (!_dbus_validate_path (&str, 0,
                                           _dbus_string_get_length (&str)))
                   return DBUS_INVALID_BAD_PATH;
@@ -430,7 +430,7 @@ validate_body_helper (DBusTypeReader       *reader,
             else if (current_type == DBUS_TYPE_STRING)
               {
                 DBusString str;
-                _dbus_string_init_const_len (&str, p, claimed_len);
+                _dbus_string_init_const_len (&str, (const char *) p, claimed_len);
                 if (!_dbus_string_validate_utf8 (&str, 0,
                                                  _dbus_string_get_length (&str)))
                   return DBUS_INVALID_BAD_UTF8_IN_STRING;
@@ -529,7 +529,7 @@ validate_body_helper (DBusTypeReader       *reader,
             if (claimed_len + 1 > (unsigned long) (end - p))
               return DBUS_INVALID_SIGNATURE_LENGTH_OUT_OF_BOUNDS;
 
-            _dbus_string_init_const_len (&str, p, claimed_len);
+            _dbus_string_init_const_len (&str, (const char *) p, claimed_len);
             validity =
               _dbus_validate_signature_with_reason (&str, 0,
                                                     _dbus_string_get_length (&str));
@@ -573,7 +573,7 @@ validate_body_helper (DBusTypeReader       *reader,
             if (claimed_len + 1 > (unsigned long) (end - p))
               return DBUS_INVALID_VARIANT_SIGNATURE_LENGTH_OUT_OF_BOUNDS;
 
-            _dbus_string_init_const_len (&sig, p, claimed_len);
+            _dbus_string_init_const_len (&sig, (const char *) p, claimed_len);
             reason = _dbus_validate_signature_with_reason (&sig, 0,
                                            _dbus_string_get_length (&sig));
             if (!(reason == DBUS_VALID))
diff --git a/dbus/dbus-sha.c b/dbus/dbus-sha.c
index febfba20..8dd05fdc 100644
--- a/dbus/dbus-sha.c
+++ b/dbus/dbus-sha.c
@@ -524,7 +524,7 @@ check_sha_binary (const unsigned char *input,
   DBusString expected_str;
   DBusString results;
 
-  _dbus_string_init_const_len (&input_str, input, input_len);
+  _dbus_string_init_const_len (&input_str, (const char *) input, input_len);
   _dbus_string_init_const (&expected_str, expected);
 
   if (!_dbus_string_init (&results))