diff --git a/sql/patch_42_43_b.sql b/sql/patch_42_43_b.sql
index 8a7e75e7d131795c5cdcdb5c5d8808e05ba084ed..b0063e5a9aed4004228f3d90e82fec8ac4753f60 100644
--- a/sql/patch_42_43_b.sql
+++ b/sql/patch_42_43_b.sql
@@ -5,7 +5,7 @@
 # description:
 # Add probe2transcript to type enum in unmapped_object
 
-ALTER TABLE unmapped_object CHANGE COLUMN type type ENUM('xref','cDNA','Marker', 'probe2transcript');
+ALTER TABLE unmapped_object CHANGE COLUMN type type ENUM('xref','cDNA','Marker', 'probe2transcript') NOT NULL;
 
 
 # patch identifier