Biblatex adds comma before parentheses

Question

This is recent behavior, but I couldn't figure out since exactly when this is happening:

% !TEX encoding = UTF-8 Unicode
% !TEX TS-program = pdflatexmk
\documentclass{beamer}

\usepackage{filecontents}

\begin{filecontents}{foo.bib}
@misc{Fallick2004a,
author = {Fallick, Bruce and Fleischman, Charles A.},
title = {{Employer-to-Employer Flows in the U.S. Labor Market: The Complete Picture of Gross Worker Flows}},
url = {http://www.federalreserve.gov/econresdata/researchdata/feds200434.html},
year = {2004}
}
\end{filecontents}

\usepackage[
    backend=biber,
    style=authoryear-comp,
    natbib=true
]{biblatex}
\bibliography{foo}
\begin{document}

\begin{frame}
\citet{Fallick2004a}
\end{frame}
\end{document}

Output:

Fallick and Fleischman, (2004)

This happens for all sorts of references, but only textcite and citet, not citep. I tried re-installing

sudo apt-get install texlive-full

to no avail.