diff --git a/pyparsing.spec b/pyparsing.spec
index be85026..7760307 100644
--- a/pyparsing.spec
+++ b/pyparsing.spec
@@ -51,7 +51,8 @@ dos2unix -k examples/*
 
 
 %generate_buildrequires
-%pyproject_buildrequires -t
+# tox lists only the [diagrams] extra and coverage as deps, so we bypass it
+%pyproject_buildrequires -x diagrams
 
 
 %build