diff --git a/src/natcap/invest/seasonal_water_yield/seasonal_water_yield.py b/src/natcap/invest/seasonal_water_yield/seasonal_water_yield.py
index 4f8d7396ac..fc2b6c18f7 100644
--- a/src/natcap/invest/seasonal_water_yield/seasonal_water_yield.py
+++ b/src/natcap/invest/seasonal_water_yield/seasonal_water_yield.py
@@ -70,7 +70,14 @@
             "contents": {
                 # monthly precipitation maps, each file ending in a number 1-12
                 "[MONTH]": {
-                    **spec_utils.PRECIP,
+                    "type": "raster",
+                    "bands": {
+                        1: {
+                            "type": "number",
+                            "units": u.millimeter/u.month,
+                        },
+                    },
+                    "name": gettext("precipitation"),
                     "about": gettext(
                         "Twelve files, one for each month. File names must "
                         "end with the month number (1-12). For example, "