diff --git a/pyproject.toml b/pyproject.toml
index 39aa261c1b4..d0419d550f4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ include = ['openmc*', 'scripts*']
 exclude = ['tests*']
 
 [tool.setuptools.package-data]
-"openmc.data.effective_dose" = ["*.txt"]
+"openmc.data.effective_dose" = ["**/*.txt"]
 "openmc.data" = ["*.txt", "*.DAT", "*.json", "*.h5"]
 "openmc.lib" = ["libopenmc.dylib", "libopenmc.so"]