diff --git a/COMPILATION.md b/COMPILATION.md
index 0af0429..1b05f6e 100644
--- a/COMPILATION.md
+++ b/COMPILATION.md
@@ -68,7 +68,7 @@ On Windows, use [MSYS2](https://www.msys2.org/) to compile for itself.
 2. Install dependencies onto MSYS2:
 
    ```sh
-   pacman -S git autoconf automake gcc make pkg-config libopenssl-devel libcurl-devel libxml2-devel libzstd-devel
+   pacman -S git autoconf automake gcc make pkg-config openssl-devel libcurl-devel libxml2-devel libzstd-devel
    ```
 
 3. Clone this repository, then change directory into the cloned one.
@@ -101,7 +101,7 @@ On Windows, use [MSYS2](https://www.msys2.org/) to compile for itself.
    ```sh
    ./autogen.sh
    PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$(pwd)" ./configure
-   make
+   make CXXFLAGS="-I/usr/include"
    ```
 
 7. Copy binary files to distribute at one place:
diff --git a/src/fdcache_entity.cpp b/src/fdcache_entity.cpp
index 6d522c0..4b46087 100644
--- a/src/fdcache_entity.cpp
+++ b/src/fdcache_entity.cpp
@@ -2427,7 +2427,7 @@ int FdEntity::UploadPendingHasLock(int fd)
 // For systems where the fallocate function cannot be detected, use a dummy function.
 // ex. OSX
 //
-#ifndef HAVE_FALLOCATE
+#if !defined(HAVE_FALLOCATE) || defined(__MSYS__)
 static int fallocate(int /*fd*/, int /*mode*/, off_t /*offset*/, off_t /*len*/)
 {
     errno = ENOSYS;     // This is a bad idea, but the caller can handle it simply.