diff --git a/backends/alpm/pk-alpm-transaction.c b/backends/alpm/pk-alpm-transaction.c
index bc1273375..2ff5d33f3 100644
--- a/backends/alpm/pk-alpm-transaction.c
+++ b/backends/alpm/pk-alpm-transaction.c
@@ -361,7 +361,7 @@ pk_alpm_transaction_conv_cb (void *ctx, alpm_question_t *question)
 }
 
 static void
-pk_alpm_transaction_output_end ()
+pk_alpm_transaction_output_end (void)
 {
 	tpkg = NULL;