diff --git a/src/lib-sieve/plugins/include/ext-include-variables.c b/src/lib-sieve/plugins/include/ext-include-variables.c
index bae0048063e9b43fd6a058fc467d8d312850fe8b..df10c26a12af5841fee722e879c15c9b3e82aad6 100644
--- a/src/lib-sieve/plugins/include/ext-include-variables.c
+++ b/src/lib-sieve/plugins/include/ext-include-variables.c
@@ -61,7 +61,7 @@ struct sieve_variable *ext_include_variable_import_global
 				struct ext_include_variable *varctx = 
 					(struct ext_include_variable *) impvar->context;
 				sieve_command_validate_warning(valdtr, cmd,
-	                "variable '%s' already imported earlier at line %d", variable, 
+					"variable '%s' already imported earlier at line %d", variable, 
 					varctx->source_line);
 			}
 		}