diff --git a/src/main/java/net/openhft/chronicle/hash/impl/VanillaChronicleHash.java b/src/main/java/net/openhft/chronicle/hash/impl/VanillaChronicleHash.java
index 39111e31f..2c47fc690 100644
--- a/src/main/java/net/openhft/chronicle/hash/impl/VanillaChronicleHash.java
+++ b/src/main/java/net/openhft/chronicle/hash/impl/VanillaChronicleHash.java
@@ -17,7 +17,6 @@
 
 package net.openhft.chronicle.hash.impl;
 
-import com.sun.jna.Native;
 import com.sun.jna.Platform;
 import net.openhft.chronicle.algo.locks.*;
 import net.openhft.chronicle.bytes.BytesStore;
@@ -29,6 +28,7 @@ import net.openhft.chronicle.hash.*;
 import net.openhft.chronicle.hash.impl.util.BuildVersion;
 import net.openhft.chronicle.hash.impl.util.Cleaner;
 import net.openhft.chronicle.hash.impl.util.CleanerUtils;
+import net.openhft.chronicle.hash.impl.util.jna.PosixFallocate;
 import net.openhft.chronicle.hash.impl.util.jna.PosixMsync;
 import net.openhft.chronicle.hash.impl.util.jna.WindowsMsync;
 import net.openhft.chronicle.hash.serialization.DataAccess;
@@ -42,12 +42,9 @@ import net.openhft.chronicle.wire.Marshallable;
 import net.openhft.chronicle.wire.WireIn;
 import net.openhft.chronicle.wire.WireOut;
 import org.jetbrains.annotations.NotNull;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.*;
 import java.lang.ref.WeakReference;
-import java.lang.reflect.Field;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.util.ArrayList;
@@ -70,9 +67,6 @@ public abstract class VanillaChronicleHash<K,
         ECQ extends ExternalHashQueryContext<K>>
         implements ChronicleHash<K, C, SC, ECQ>, Marshallable {
 
-    private static final Logger LOG =
-            LoggerFactory.getLogger(VanillaChronicleHash.class.getName());
-
     public static final long TIER_COUNTERS_AREA_SIZE = 64;
     public static final long RESERVED_GLOBAL_MUTABLE_STATE_BYTES = 1024;
 
@@ -949,36 +943,6 @@ public abstract class VanillaChronicleHash<K,
                 firstBulkToMapOffsetWithinMapping);
     }
 
-    private static class PosixFallocateProxy {
-
-        static {
-            Native.register(Platform.C_LIBRARY_NAME);
-        }
-
-        private static native int posix_fallocate(int fd, long offset, long length);
-
-        private static int getNativeFileDescriptor(FileDescriptor descriptor) {
-            try {
-                final Field field = descriptor.getClass().getDeclaredField("fd");
-                field.setAccessible(true);
-                return (int) field.get(descriptor);
-            } catch (final Exception e) {
-                LOG.warn("unsupported FileDescriptor implementation: e={}", e.getLocalizedMessage());
-                return -1;
-            }
-        }
-
-        static void posixFallocate(FileDescriptor descriptor, long offset, long length) {
-            int fd = getNativeFileDescriptor(descriptor);
-            if (fd != -1) {
-                int ret = posix_fallocate(getNativeFileDescriptor(descriptor), offset, length);
-                if (ret != 0) {
-                    LOG.warn("posix_fallocate() returned {}", ret);
-                }
-            }
-        }
-    }
-
     /**
      * @see net.openhft.chronicle.bytes.MappedFile#acquireByteStore(long, MappedBytesStoreFactory)
      */
@@ -1001,7 +965,7 @@ public abstract class VanillaChronicleHash<K,
             // "XFS: ... possible memory allocation deadlock size ... in kmem_alloc (mode:0x250)".
             // We can fix this by trying calling posix_fallocate to preallocate the space.
             if (Platform.isLinux()) {
-                PosixFallocateProxy.posixFallocate(raf.getFD(), 0, minFileSize);
+                PosixFallocate.fallocate(raf.getFD(), 0, minFileSize);
             }
         }
         long address = OS.map(fileChannel, READ_WRITE, mappingOffsetInFile, mapSize);
diff --git a/src/main/java/net/openhft/chronicle/hash/impl/util/jna/PosixFallocate.java b/src/main/java/net/openhft/chronicle/hash/impl/util/jna/PosixFallocate.java
new file mode 100644
index 000000000..5aecb5cb0
--- /dev/null
+++ b/src/main/java/net/openhft/chronicle/hash/impl/util/jna/PosixFallocate.java
@@ -0,0 +1,46 @@
+package net.openhft.chronicle.hash.impl.util.jna;
+
+import com.sun.jna.Native;
+import com.sun.jna.Platform;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.FileDescriptor;
+import java.lang.reflect.Field;
+
+public final class PosixFallocate {
+
+    private static final Logger LOG =
+            LoggerFactory.getLogger(PosixFallocate.class.getName());
+
+    static {
+        Native.register(Platform.C_LIBRARY_NAME);
+    }
+
+    private PosixFallocate() {
+    }
+
+    public static void fallocate(FileDescriptor descriptor, long offset, long length) {
+        int fd = getNativeFileDescriptor(descriptor);
+        if (fd != -1) {
+            int ret = posix_fallocate(getNativeFileDescriptor(descriptor), offset, length);
+            if (ret != 0) {
+                LOG.warn("posix_fallocate() returned {}", ret);
+            }
+        }
+    }
+
+    private static native int posix_fallocate(int fd, long offset, long length);
+
+    private static int getNativeFileDescriptor(FileDescriptor descriptor) {
+        try {
+            final Field field = descriptor.getClass().getDeclaredField("fd");
+            field.setAccessible(true);
+            return (int) field.get(descriptor);
+        } catch (final Exception e) {
+            LOG.warn("unsupported FileDescriptor implementation: e={}", e.getLocalizedMessage());
+            return -1;
+        }
+    }
+
+}