diff --git a/conda/artiq/meta.yaml b/conda/artiq/meta.yaml
index cd22f0919..a6f82b8bc 100644
--- a/conda/artiq/meta.yaml
+++ b/conda/artiq/meta.yaml
@@ -25,7 +25,7 @@ requirements:
     - numpy
     - prettytable
     - asyncserial
-    - sphinx =1.4.8
+    - sphinx 1.4.8
     - sphinx-argparse
     - sphinxcontrib-wavedrom
     - sphinx_rtd_theme