diff --git a/src/plugins/imapsieve/ext-imapsieve-environment.c b/src/plugins/imapsieve/ext-imapsieve-environment.c
index 2b61cd4a2254636d64de7aa04753ef69b01b0523..8073de5b518cccea98eb28aad8365c4f90c2cdc4 100644
--- a/src/plugins/imapsieve/ext-imapsieve-environment.c
+++ b/src/plugins/imapsieve/ext-imapsieve-environment.c
@@ -171,8 +171,8 @@ void ext_imapsieve_environment_items_register(
 					&imap_changedflags_env_item);
 }
 
-void ext_imapsieve_environment_vendor_items_register
-(const struct sieve_extension *ext, const struct sieve_runtime_env *renv)
+void ext_imapsieve_environment_vendor_items_register(
+	const struct sieve_extension *ext, const struct sieve_runtime_env *renv)
 {
 	const struct sieve_extension *env_ext =
 		(const struct sieve_extension *)ext->context;