diff --git a/backend/windmill-worker/src/duckdb_executor.rs b/backend/windmill-worker/src/duckdb_executor.rs
index f5a13d13ba..73136e1cc0 100644
--- a/backend/windmill-worker/src/duckdb_executor.rs
+++ b/backend/windmill-worker/src/duckdb_executor.rs
@@ -793,11 +793,9 @@ mod tests {
             "sslmode": "require"
         });
         let result = format_attach_db_conn_str(db_resource, "postgres").unwrap();
-        assert!(result.contains("dbname=mydb"));
-        assert!(result.contains("user=admin"));
-        assert!(result.contains("host=localhost"));
-        assert!(result.contains("password=secret123"));
-        assert!(result.contains("port=5432"));
+        // Should be in URI format: postgres://user:password@host:port/dbname?sslmode=require
+        assert!(result.starts_with("postgres://"));
+        assert!(result.contains("admin:secret123@localhost:5432/mydb"));
         assert!(result.contains("sslmode=require"));
     }
 
@@ -808,11 +806,10 @@ mod tests {
             "dbname": "production"
         });
         let result = format_attach_db_conn_str(db_resource, "postgres").unwrap();
-        assert!(result.contains("dbname=production"));
-        assert!(result.contains("host=db.example.com"));
-        // Optional fields should result in empty strings
-        assert!(!result.contains("user="));
-        assert!(!result.contains("password="));
+        // Should be in URI format with defaults: postgres://postgres:@host:5432/dbname?sslmode=prefer
+        assert!(result.starts_with("postgres://"));
+        assert!(result.contains("@db.example.com:5432/production"));
+        assert!(result.contains("sslmode=prefer"));
     }
 
     #[test]
@@ -822,8 +819,10 @@ mod tests {
             "dbname": "test"
         });
         let result = format_attach_db_conn_str(db_resource, "postgresql").unwrap();
-        assert!(result.contains("dbname=test"));
-        assert!(result.contains("host=localhost"));
+        // Should be in URI format (postgresql is treated the same as postgres)
+        assert!(result.starts_with("postgres://"));
+        assert!(result.contains("@localhost:5432/test"));
+        assert!(result.contains("sslmode=prefer"));
     }
 
     #[test]
@@ -863,7 +862,9 @@ mod tests {
             "dbname": "test"
         });
         let result = format_attach_db_conn_str(db_resource, "POSTGRES").unwrap();
-        assert!(result.contains("dbname=test"));
+        // Should be in URI format
+        assert!(result.starts_with("postgres://"));
+        assert!(result.contains("@localhost:5432/test"));
     }
 
     #[cfg(feature = "mysql")]