diff --git a/schema/mysql-migrations/upgrade_127.sql b/schema/mysql-migrations/upgrade_127.sql
index 91051d2c..575675e3 100644
--- a/schema/mysql-migrations/upgrade_127.sql
+++ b/schema/mysql-migrations/upgrade_127.sql
@@ -40,7 +40,7 @@ CREATE TABLE icinga_flat_var (
   flatname VARCHAR(512) NOT NULL COLLATE utf8_bin,
   flatvalue TEXT NOT NULL,
   PRIMARY KEY (var_checksum, flatname_checksum),
-  INDEX search_varname (flatname),
+  INDEX search_varname (flatname (191)),
   INDEX search_varvalue (flatvalue (128)),
   CONSTRAINT flat_var_var
     FOREIGN KEY checksum (var_checksum)
diff --git a/schema/mysql.sql b/schema/mysql.sql
index 3f7aab0b..d57ea3a5 100644
--- a/schema/mysql.sql
+++ b/schema/mysql.sql
@@ -1398,7 +1398,7 @@ CREATE TABLE icinga_flat_var (
   flatname VARCHAR(512) NOT NULL COLLATE utf8_bin,
   flatvalue TEXT NOT NULL,
   PRIMARY KEY (var_checksum, flatname_checksum),
-  INDEX search_varname (flatname),
+  INDEX search_varname (flatname (191)),
   INDEX search_varvalue (flatvalue (128)),
   CONSTRAINT flat_var_var
   FOREIGN KEY checksum (var_checksum)