diff --git a/Makefile b/Makefile
index fae4ce181e..65e89b5095 100644
--- a/Makefile
+++ b/Makefile
@@ -1080,7 +1080,8 @@ build-manual = $(call quiet-command,CONFDIR="$(qemu_confdir)" $(SPHINX_BUILD) $(
 # We assume all RST files in the manual's directory are used in it
 manual-deps = $(wildcard $(SRC_PATH)/docs/$1/*.rst) \
               $(SRC_PATH)/docs/defs.rst.inc \
-              $(SRC_PATH)/docs/$1/conf.py $(SRC_PATH)/docs/conf.py
+              $(SRC_PATH)/docs/$1/conf.py $(SRC_PATH)/docs/conf.py \
+              $(SRC_PATH)/docs/sphinx/*.py
 # Macro to write out the rule and dependencies for building manpages
 # Usage: $(call define-manpage-rule,manualname,manpage1 manpage2...[,extradeps])
 # 'extradeps' is optional, and specifies extra files (eg .hx files) that