diff --git a/modules/libpref/public/nsIAutoConfig.idl b/modules/libpref/public/nsIAutoConfig.idl
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/modules/libpref/public/prefldap.h b/modules/libpref/public/prefldap.h
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/modules/libpref/src/nsAutoConfig.cpp b/modules/libpref/src/nsAutoConfig.cpp
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/modules/libpref/src/nsAutoConfig.h b/modules/libpref/src/nsAutoConfig.h
deleted file mode 100644
index e69de29bb2d..00000000000