diff --git a/src/cache/tracer_cache.jl b/src/cache/tracer_cache.jl
index 21e09eff368..ca09d54a139 100644
--- a/src/cache/tracer_cache.jl
+++ b/src/cache/tracer_cache.jl
@@ -1,4 +1,5 @@
 import Dates: Year
+import ClimaUtilities.TimeVaryingInputs
 import ClimaUtilities.TimeVaryingInputs:
     TimeVaryingInput, LinearPeriodFillingInterpolation
 import Interpolations as Intp
@@ -44,7 +45,10 @@ function tracer_cache(Y, atmos, prescribed_aerosol_names, start_date)
                 reference_date = start_date,
                 regridder_type = :InterpolationsRegridder,
                 regridder_kwargs = (; extrapolation_bc),
-                method = LinearPeriodFillingInterpolation(Year(1)),
+                method = LinearPeriodFillingInterpolation(
+                    Year(1),
+                    TimeVaryingInputs.Flat(),
+                ),
             ) for name in prescribed_aerosol_names
         ]