diff --git a/test/unit/test_mc_cell_group_gpu.cpp b/test/unit/test_mc_cell_group_gpu.cpp
index a482d7c84d6893b3135d1e1b2c48b70c3de374f3..7b2306e603992993777df23bfa4c1b20ae036eba 100644
--- a/test/unit/test_mc_cell_group_gpu.cpp
+++ b/test/unit/test_mc_cell_group_gpu.cpp
@@ -44,7 +44,7 @@ TEST(mc_cell_group, gpu_test)
     rec.nernst_ion("k");
 
     mc_cell_group group{{0}, rec, lowered_cell()};
-    group.advance(epoch(0, 50), 0.01, {});
+    group.advance(epoch(0, 0., 50.), 0.01, {});
 
     // The model is expected to generate 4 spikes as a result of the
     // fixed stimulus over 50 ms