diff --git a/dev-python/bokeh/bokeh-0.12.6.ebuild b/dev-python/bokeh/bokeh-0.12.6.ebuild
index 523b73a0222e7..e3483aea84366 100644
--- a/dev-python/bokeh/bokeh-0.12.6.ebuild
+++ b/dev-python/bokeh/bokeh-0.12.6.ebuild
@@ -47,6 +47,7 @@ DEPEND="
 		dev-python/pytest[${PYTHON_USEDEP}]
 		dev-python/flexx[${PYTHON_USEDEP}]
 		dev-python/mock[${PYTHON_USEDEP}]
+		dev-python/nbformat[${PYTHON_USEDEP}]
 		dev-python/pillow[${PYTHON_USEDEP}]
 		dev-python/pytest[${PYTHON_USEDEP}]
 		dev-python/pytest-cov[${PYTHON_USEDEP}]