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-rw-r--r--camel/camel-medium.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/camel/camel-medium.c b/camel/camel-medium.c
index 35a6c7e851..1fd77c28ad 100644
--- a/camel/camel-medium.c
+++ b/camel/camel-medium.c
@@ -162,8 +162,8 @@ add_header (CamelMedium *medium, const gchar *header_name,
* headers.
**/
void
-camel_medium_add_header (CamelMedium *medium, gchar *header_name,
- gchar *header_value)
+camel_medium_add_header (CamelMedium *medium, const gchar *header_name,
+ const gchar *header_value)
{
g_return_if_fail (CAMEL_IS_MEDIUM (medium));
g_return_if_fail (header_name != NULL);