diff --git a/meta/classes-recipe/python_mesonpy.bbclass b/meta/classes-recipe/python_mesonpy.bbclass
index 81c087c7c7..37b231cef5 100644
--- a/meta/classes-recipe/python_mesonpy.bbclass
+++ b/meta/classes-recipe/python_mesonpy.bbclass
@@ -17,8 +17,6 @@ meson_do_qa_configure () {
 # ERROR: Got argument buildtype as both -Dbuildtype and --buildtype. Pick one.
 MESONOPTS:remove = "--buildtype ${MESON_BUILDTYPE}"
 
-CONFIGURE_FILES = "pyproject.toml"
-
 DEPENDS += "python3-wheel-native python3-meson-python-native"
 
 def mesonpy_get_args(d):
diff --git a/meta/classes-recipe/python_pep517.bbclass b/meta/classes-recipe/python_pep517.bbclass
index e8cd1923ef..2c144d39b3 100644
--- a/meta/classes-recipe/python_pep517.bbclass
+++ b/meta/classes-recipe/python_pep517.bbclass
@@ -61,3 +61,6 @@ python_pep517_do_bootstrap_install () {
 }
 
 EXPORT_FUNCTIONS do_configure do_compile do_install
+
+# Tell externalsrc this changing means it needs to reconfigure
+CONFIGURE_FILES += "pyproject.toml"