diff --git a/klippy/printer.py b/klippy/printer.py
index b9724d2510..0bae51cf64 100644
--- a/klippy/printer.py
+++ b/klippy/printer.py
@@ -666,6 +666,7 @@ def main():
         logging.getLogger().setLevel(debuglevel)
     logging.info("=======================")
     logging.info("Starting Klippy...")
+    util.lock_memory()
     git_info = util.get_git_version()
     git_vers = git_info["version"]
 
diff --git a/klippy/util.py b/klippy/util.py
index 32b5485b30..5c0703bc2c 100644
--- a/klippy/util.py
+++ b/klippy/util.py
@@ -3,6 +3,8 @@
 # Copyright (C) 2016-2020  Kevin O'Connor <kevin@koconnor.net>
 #
 # This file may be distributed under the terms of the GNU GPLv3 license.
+import ctypes
+import ctypes.util
 import fcntl
 import json
 import logging
@@ -27,6 +29,24 @@ def fix_sigint():
 fix_sigint()
 
 
+# Lock all current and future memory pages into RAM to prevent swapping
+def lock_memory():
+    MCL_CURRENT = 1
+    MCL_FUTURE = 2
+    try:
+        libc = ctypes.CDLL("libc.so.6", use_errno=True)
+        result = libc.mlockall(MCL_CURRENT | MCL_FUTURE)
+        if result != 0:
+            errno_val = ctypes.get_errno()
+            raise OSError(errno_val, os.strerror(errno_val))
+        logging.info(
+            "Memory locked to RAM (mlockall MCL_CURRENT|MCL_FUTURE):"
+            " swapping disabled"
+        )
+    except Exception as e:
+        logging.warning("Failed to lock memory: %s", e)
+
+
 # Set a file-descriptor as non-blocking
 def set_nonblock(fd):
     fcntl.fcntl(