Liberal Democrat Lynne Featherstone has replaced Norman Baker as crime prevention minister in the Home Office.
The Jewish MP has been moved from her role in the Department for International Development following Mr Baker’s resignation on Monday.
He quit after claiming a series of clashes with Home Secretary Theresa May over drugs policies.
Ms Featherstone, Hornsey and Wood Green MP, said she expected no such difficulties. She previously worked in the Home Office as an under-secretary for equalities.
She said: “I am very proud of what I was able to achieve in my previous role there, not least introducing equal marriage, ending the fingerprinting of children and banning wheel clamping on private land.
“I am also looking forward to continuing my work tackling violence against women and girls and on ending female genital mutilation at home and abroad.
“I have always had a very constructive relationship with Theresa May and I look forward to working with her again.”
Lib Dem leader Nick Clegg said: “Lynne Featherstone has been an exceptional minister over the last four and a half years and returns to the Home Office, where her tough but liberal approach will be invaluable.”