diff --git a/src/Boundaries/gasexchange.jl b/src/Boundaries/gasexchange.jl
index 3cde0e6e1..d8e4f3781 100644
--- a/src/Boundaries/gasexchange.jl
+++ b/src/Boundaries/gasexchange.jl
@@ -259,4 +259,4 @@ end
 
 @inline get_value(x, y, t, air_concentration::Number) = air_concentration
 @inline get_value(x, y, t, air_concentration::Function) = air_concentration(x, y, t)
-@inline get_value(x, y, t, conc::Field{Center, Center, Center}) = interpolate(conc, Center(), Center(), Center(), conc.grid, x, y, 0)
\ No newline at end of file
+@inline get_value(x, y, t, conc::Field{Center, Center, Center}) = interpolate(conc, Center(), Center(), Center(), conc.grid, x, y, 0.0)
\ No newline at end of file
diff --git a/test/test_gasexchange.jl b/test/test_gasexchange.jl
index 573ce8316..d3ddf6443 100644
--- a/test/test_gasexchange.jl
+++ b/test/test_gasexchange.jl
@@ -25,7 +25,7 @@ function test_gas_exchange_model(grid, air_concentration)
     set!(model, T = 15.0, S = 35.0, DIC = 2220, Alk = 2500)
 
     # is everything communicating properly? (can't think of a way to not use allow scalar here)
-    value = CUDA.@allowscalar Oceananigans.getbc(model.tracers.DIC.boundary_conditions.top, 1.0, 1.0, grid, model.clock, fields(model))
+    value = CUDA.@allowscalar Oceananigans.getbc(model.tracers.DIC.boundary_conditions.top, 1, 1, grid, model.clock, fields(model))
 
     @test value ≈ -0.0003 atol = 0.0001