diff --git a/features/TESTS/filesystem/heap_block_device/main.cpp b/features/TESTS/filesystem/heap_block_device/main.cpp
index 2a5e9d6e7f..7a786cc4e3 100644
--- a/features/TESTS/filesystem/heap_block_device/main.cpp
+++ b/features/TESTS/filesystem/heap_block_device/main.cpp
@@ -23,12 +23,8 @@
 
 using namespace utest::v1;
 
-#define TEST_BLOCK_SIZE 512
-#if MBED_SMALL_TARGET
-#    define TEST_BLOCK_DEVICE_SIZE 8*TEST_BLOCK_SIZE
-#else
-#    define TEST_BLOCK_DEVICE_SIZE 16*TEST_BLOCK_SIZE
-#endif
+#define TEST_BLOCK_SIZE 128
+#define TEST_BLOCK_DEVICE_SIZE 32*TEST_BLOCK_SIZE
 #define TEST_BLOCK_COUNT 10
 #define TEST_ERROR_MASK 16