diff --git a/examples/mallocMC_example01.cpp b/examples/mallocMC_example01.cpp
index fb99f599..e544072a 100644
--- a/examples/mallocMC_example01.cpp
+++ b/examples/mallocMC_example01.cpp
@@ -43,7 +43,7 @@ using Acc = alpaka::ExampleDefaultAcc<Dim, Idx>;
 struct ScatterHeapConfig
 {
     static constexpr auto pagesize = 4096;
-    static constexpr auto accessblocksize = 2u * 1024u * 1024u * 1024u;
+    static constexpr auto accessblocksize = 512u * 1024u * 1024u;
     static constexpr auto regionsize = 16;
     static constexpr auto wastefactor = 2;
     static constexpr auto resetfreedpages = false;
diff --git a/examples/mallocMC_example03.cpp b/examples/mallocMC_example03.cpp
index 4c09d43f..f2262b63 100644
--- a/examples/mallocMC_example03.cpp
+++ b/examples/mallocMC_example03.cpp
@@ -44,7 +44,7 @@ using Acc = alpaka::ExampleDefaultAcc<Dim, Idx>;
 struct ScatterConfig
 {
     static constexpr auto pagesize = 4096;
-    static constexpr auto accessblocksize = 2u * 1024u * 1024u * 1024u;
+    static constexpr auto accessblocksize = 512u * 1024u * 1024u;
     static constexpr auto regionsize = 16;
     static constexpr auto wastefactor = 2;
     static constexpr auto resetfreedpages = false;
diff --git a/tests/dimensions.cpp b/tests/dimensions.cpp
index 1f6465e8..b8b02399 100644
--- a/tests/dimensions.cpp
+++ b/tests/dimensions.cpp
@@ -34,7 +34,7 @@ using Idx = std::size_t;
 struct ScatterConfig
 {
     static constexpr auto pagesize = 4096;
-    static constexpr auto accessblocksize = 2u * 1024u * 1024u * 1024u;
+    static constexpr auto accessblocksize = 256u * 1024u;
     static constexpr auto regionsize = 16;
     static constexpr auto wastefactor = 2;
     static constexpr auto resetfreedpages = false;
diff --git a/tests/policies.cpp b/tests/policies.cpp
index 29ec3912..b80abb17 100644
--- a/tests/policies.cpp
+++ b/tests/policies.cpp
@@ -36,7 +36,7 @@ using Acc = alpaka::AccGpuCudaRt<Dim, Idx>;
 struct ScatterConfig
 {
     static constexpr auto pagesize = 4096;
-    static constexpr auto accessblocksize = 8;
+    static constexpr auto accessblocksize = 256U * 1024U;
     static constexpr auto regionsize = 16;
     static constexpr auto wastefactor = 2;
     static constexpr auto resetfreedpages = false;