diff --git a/catalogue/common_catalogue_schema.sql b/catalogue/common_catalogue_schema.sql
index 607c124bf6dc8ad55998287f18f704d3459158b8..e37a2d5022b9a3b87d071002acff2f1171485b29 100644
--- a/catalogue/common_catalogue_schema.sql
+++ b/catalogue/common_catalogue_schema.sql
@@ -93,7 +93,7 @@ CREATE TABLE TAPE(
   LAST_WRITE_DRIVE        VARCHAR(100),
   LAST_WRITE_TIME         NUMERIC(20, 0),
   READ_MOUNT_COUNT        NUMERIC(20, 0)  DEFAULT 0 CONSTRAINT TAPE_RMC_NN NOT NULL,
-  WRITE_MOUNT_COUNT       NUMERIC(20, 0)  DEFAULT 0,
+  WRITE_MOUNT_COUNT       NUMERIC(20, 0)  DEFAULT 0 CONSTRAINT TAPE_WMC_NN NOT NULL,
   USER_COMMENT            VARCHAR(1000)   CONSTRAINT TAPE_UC_UN   NOT NULL,
   CREATION_LOG_USER_NAME  VARCHAR(100)    CONSTRAINT TAPE_CLUN_UN NOT NULL,
   CREATION_LOG_HOST_NAME  VARCHAR(100)    CONSTRAINT TAPE_CLHN_UN NOT NULL,