diff --git a/pylib/Makefile b/pylib/Makefile
index afd5d4c87..978cabd3b 100644
--- a/pylib/Makefile
+++ b/pylib/Makefile
@@ -6,7 +6,7 @@ MAKEFLAGS += --warn-undefined-variables
 MAKEFLAGS += --no-builtin-rules
 RUNARGS :=
 .SUFFIXES:
-BLACKARGS := -t py36 anki tests --exclude=backend_pb2
+BLACKARGS := -t py36 anki tests --exclude='backend_pb2|buildhash'
 ISORTARGS := anki tests
 
 $(shell mkdir -p .build ../build)