diff --git a/doc/en/Makefile b/doc/en/Makefile
index f93d84557..cc06178f4 100644
--- a/doc/en/Makefile
+++ b/doc/en/Makefile
@@ -13,6 +13,7 @@ PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 
 REGENDOC_ARGS := \
+	--normalize "/[ \t]+\n/\n/" \
 	--normalize "/in \d+.\d+ seconds/in 0.12 seconds/" \
 	--normalize "@/tmp/pytest-of-.*/pytest-\d+@PYTEST_TMPDIR@" \
 	--normalize "@pytest-(\d+)\\.[^ ,]+@pytest-\1.x.y@" \