diff --git a/src/lib/parameters/DynamicSparseLayerTest.cpp b/src/lib/parameters/DynamicSparseLayerTest.cpp
index f51f1d5c76..fe63313179 100644
--- a/src/lib/parameters/DynamicSparseLayerTest.cpp
+++ b/src/lib/parameters/DynamicSparseLayerTest.cpp
@@ -150,7 +150,7 @@ TEST_F(DynamicSparseLayerConcurrentTest, ConcurrentMultipleWriters)
 	constexpr int TOTAL = NUM_WRITERS * PARAMS_PER_WRITER;
 
 	for (int rep = 0; rep < 20; rep++) {
-		DynamicSparseLayer layer(&stub, /*n_prealloc=*/2, /*n_grow=*/1);
+		DynamicSparseLayer layer(&stub, /*n_prealloc=*/TOTAL, /*n_grow=*/1);
 
 		std::vector<std::thread> writers;