diff --git a/catalogue/common_catalogue_schema.sql b/catalogue/common_catalogue_schema.sql
index 588cd307e4f49780956f6e0a397d92ed6ca5d67b..607c124bf6dc8ad55998287f18f704d3459158b8 100644
--- a/catalogue/common_catalogue_schema.sql
+++ b/catalogue/common_catalogue_schema.sql
@@ -92,7 +92,7 @@ CREATE TABLE TAPE(
   LAST_READ_TIME          NUMERIC(20, 0),
   LAST_WRITE_DRIVE        VARCHAR(100),
   LAST_WRITE_TIME         NUMERIC(20, 0),
-  READ_MOUNT_COUNT        NUMERIC(20, 0)  DEFAULT 0,
+  READ_MOUNT_COUNT        NUMERIC(20, 0)  DEFAULT 0 CONSTRAINT TAPE_RMC_NN NOT NULL,
   WRITE_MOUNT_COUNT       NUMERIC(20, 0)  DEFAULT 0,
   USER_COMMENT            VARCHAR(1000)   CONSTRAINT TAPE_UC_UN   NOT NULL,
   CREATION_LOG_USER_NAME  VARCHAR(100)    CONSTRAINT TAPE_CLUN_UN NOT NULL,