diff --git a/bolt/runtime/common.h b/bolt/runtime/common.h
--- a/bolt/runtime/common.h
+++ b/bolt/runtime/common.h
@@ -422,6 +422,16 @@
   return ret;
 }
 
+int __munlock(void *addr, size_t length) {
+  int ret;
+  __asm__ __volatile__("movq $0x96, %%rax\n"
+                       "syscall\n"
+                       : "=a"(ret)
+                       : "D"(addr), "S"(length)
+                       : "cc", "rcx", "r11", "memory");
+  return ret;
+}
+
 #define _UTSNAME_LENGTH 65
 
 struct UtsNameTy {
diff --git a/bolt/runtime/hugify.cpp b/bolt/runtime/hugify.cpp
--- a/bolt/runtime/hugify.cpp
+++ b/bolt/runtime/hugify.cpp
@@ -157,6 +157,10 @@
     return;
   }
 
+  if (__munlock(From, (To - From)) == -1) {
+    char Msg[] = "[hugify] failed to unlock memory\n";
+    reportError(Msg, sizeof(Msg));
+  }
   if (__madvise(From, (To - From), 14 /* MADV_HUGEPAGE */) == -1) {
     char Msg[] = "[hugify] failed to allocate large page\n";
     // TODO: allow user to control the failure behavior.