diff --git a/chat/docs/Makefile b/chat/docs/Makefile
index 8715519..645d2cd 100644
--- a/chat/docs/Makefile
+++ b/chat/docs/Makefile
@@ -5,7 +5,7 @@
 SPHINXOPTS    =
 SPHINXBUILD   = sphinx-build
 PAPER         =
-BUILDDIR      = ../indico_chat/static/help
+BUILDDIR      = $(wildcard ../indico_*[!.])/static/help
 
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4