diff --git a/AK/BumpAllocator.h b/AK/BumpAllocator.h
index 21348a4df0c..862217f4976 100644
--- a/AK/BumpAllocator.h
+++ b/AK/BumpAllocator.h
@@ -10,7 +10,12 @@
 #include <AK/StdLibExtras.h>
 #include <AK/Types.h>
 #include <AK/kmalloc.h>
-#include <sys/mman.h>
+#if defined(AK_OS_WINDOWS)
+#    include <Windows.h>
+#    include <Memoryapi.h>
+#else
+#    include <sys/mman.h>
+#endif
 
 namespace AK {
 
@@ -73,7 +78,11 @@ public:
             }
 
             if constexpr (use_mmap) {
+#if defined(AK_OS_WINDOWS)
+                VirtualFree((LPVOID)chunk, m_chunk_size, MEM_RELEASE);
+#else
                 munmap((void*)chunk, m_chunk_size);
+#endif
             } else {
                 kfree_sized((void*)chunk, m_chunk_size);
             }
@@ -106,10 +115,19 @@ protected:
 #ifdef AK_OS_SERENITY
                 new_chunk = serenity_mmap(nullptr, m_chunk_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_RANDOMIZED | MAP_PRIVATE, 0, 0, m_chunk_size, "BumpAllocator Chunk");
 #else
+#    if defined(AK_OS_WINDOWS)
+                new_chunk = VirtualAlloc(NULL, m_chunk_size, MEM_COMMIT, PAGE_READWRITE);
+#    else
                 new_chunk = mmap(nullptr, m_chunk_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+#    endif
 #endif
+#if defined(AK_OS_WINDOWS)
+                if (new_chunk == NULL)
+                    return false;
+#else
                 if (new_chunk == MAP_FAILED)
                     return false;
+#endif
             } else {
                 new_chunk = kmalloc(m_chunk_size);
                 if (!new_chunk)