Index: src/alter.c
==================================================================
--- src/alter.c
+++ src/alter.c
@@ -693,11 +693,11 @@
     sqlite3_value *pVal = 0;
     int rc;
     rc = sqlite3ValueFromExpr(db, pDflt, SQLITE_UTF8, SQLITE_AFF_BLOB, &pVal);
     assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
     if( rc!=SQLITE_OK ){
-      assert( db->mallocFailed = 1 );
+      assert( db->mallocFailed == 1 );
       return;
     }
     if( !pVal ){
       sqlite3ErrorMsg(pParse, "Cannot add a column with non-constant default");
       return;