diff --git a/src/metadata/metadata_partition.h b/src/metadata/metadata_partition.h
index d38acd0..f9ae453 100644
--- a/src/metadata/metadata_partition.h
+++ b/src/metadata/metadata_partition.h
@@ -11,6 +11,7 @@
 
 #define PARTITION_DEFAULT		0
 #define PARTITION_INVALID		((ocf_part_id_t)-1)
+#define PARTITION_SIZE_MIN		0
 #define PARTITION_SIZE_MAX		100
 
 void ocf_metadata_get_partition_info(
diff --git a/src/mngt/ocf_mngt_io_class.c b/src/mngt/ocf_mngt_io_class.c
index e0b6d7d..e348551 100644
--- a/src/mngt/ocf_mngt_io_class.c
+++ b/src/mngt/ocf_mngt_io_class.c
@@ -256,6 +256,13 @@ static int _ocf_mngt_io_class_validate_cfg(ocf_cache_t cache,
 		return -OCF_ERR_INVAL;
 	}
 
+	if (cfg->max_size < PARTITION_SIZE_MIN ||
+			cfg->max_size > PARTITION_SIZE_MAX) {
+		ocf_cache_log(cache, log_info,
+				"Invalid value of the partition max size\n");
+		return -OCF_ERR_INVAL;
+	}
+
 	return 0;
 }