diff --git a/doc/Makefile.local b/doc/Makefile.local
index 72b8f686..9b6cfe58 100644
--- a/doc/Makefile.local
+++ b/doc/Makefile.local
@@ -70,6 +70,7 @@ install-apidocs: apidocs
 $(APIMAN): $(dir)/config.dox $(srcdir)/$(dir)/doxygen.cfg $(srcdir)/lib/notmuch.h
 	mkdir -p $(DOCBUILDDIR)/man/man3
 	doxygen $(DOXYFILE)
+	perl -pi -e 's/^[.]RI "\\fI/.RI "\\fP/' $(APIMAN)
 else
 apidocs:
 install-apidocs: