diff --git a/src/xclim/indices/_conversion.py b/src/xclim/indices/_conversion.py
index e0d3dc3ce..329171041 100644
--- a/src/xclim/indices/_conversion.py
+++ b/src/xclim/indices/_conversion.py
@@ -31,6 +31,7 @@
 
 __all__ = [
     "clausius_clapeyron_scaled_precipitation",
+    "fao_allen98",
     "heat_index",
     "humidex",
     "longwave_upwelling_radiation_from_net_downwelling",