diff --git a/.gitignore b/.gitignore
index f6db5431497c3da253018df046925dee2a42624b..360c552467acc89dcf069a59f88962bc524bdeed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 # Ignore images
 *.png
 *.jpg
+
+docs/build/
+
diff --git a/docs/Makefile b/docs/Makefile
index 11efdb9c3fcf65b7f8ed02c8206e6e711891dbf1..79dde9b012641a0945986a0ed509beee4c76da7c 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -15,7 +15,7 @@ endif
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4
 PAPEROPT_letter = -D latex_paper_size=letter
-ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) sources
 # the i18n builder cannot share the environment and doctrees with the others
 I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source