diff --git a/src/get_data.jl b/src/get_data.jl
index dab9b66..c803cef 100644
--- a/src/get_data.jl
+++ b/src/get_data.jl
@@ -451,7 +451,7 @@ function get_load_data(
             # TODO awaiting methods in PSY to make this simpler
             keys = filter(
                 key ->
-                    PSY.get_time_series_type(key) == PSY.Deterministic &&
+                    PSY.get_time_series_type(key) <: PSY.AbstractDeterministic &&
                         PSY.get_name(key) == "max_active_power",
                 PSY.get_time_series_keys(load),
             )
diff --git a/test/test_result_sorting.jl b/test/test_result_sorting.jl
index e63207d..60a1fa9 100644
--- a/test/test_result_sorting.jl
+++ b/test/test_result_sorting.jl
@@ -129,4 +129,8 @@ end
     load_data6 = PA.get_load_data(sys; aggregation = StandardLoad)
     @test length(load_data6.data) == 1
     @test length(load_data6.time) == 24
+
+    # Test with a system with `DeterministicSingleTimeSeries`
+    sys = PSB.build_system(PSB.PSISystems, "5_bus_hydro_uc_sys")
+    @test length(PA.get_load_data(sys; aggregation = ACBus).data) == 3
 end