MariaDB "Foreign key constraint is incorrectly formed" error

yuy :

Browsed through other similar questions have not helped, I'm creating two simple tables and this error pops up, have no idea where it's gone wrong:

create table department (
    dept_name varchar(20),  
    building varchar(15),  
    budget numeric(12,2),  
    primary key (dept_name)
) COLLATE='utf8_general_ci' ENGINE=INNODB;

Now when I create second table:

create table course (
    course_id varchar(7), 
    title varchar(50), 
    dept_name varchar(20), 
    credits numeric(2,0), 
    primary key (course_id), 
    foreign key (dept_name) references department
) COLLATE='utf8_general_ci' ENGINE=INNODB;

It gives me the error. What am I missing here?

GMB :

The foreign key syntax is:

foreign key (dept_name) references department(dept_name)
                       --  column name here --^

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