diff --git a/src/posix-compat.c b/src/posix-compat.c
index 46e26e4..7d7f0e4 100644
--- a/src/posix-compat.c
+++ b/src/posix-compat.c
@@ -1,7 +1,11 @@
 #include "posix-compat.h"
 
 #ifdef _WIN32
+# define VC_EXTRALEAN
+# define WIN32_LEAN_AND_MEAN
 # include <windows.h>
+# include <io.h>
+# include <fcntl.h>
 #else
 # include <unistd.h>
 # include <sys/wait.h>
@@ -21,7 +25,7 @@ struct proc_handle {
 
 struct pipe_handle {
 #ifdef _WIN32
-    // TODO
+    HANDLE fhs[2];
 #else
     int fds[2];
 #endif
@@ -49,22 +53,47 @@ void wait_process(s_proc_handle *handle, int *status) {
 }
 
 FILE *pipe_in(s_pipe_handle *p) {
+#ifdef _WIN32
+    CloseHandle(p->fhs[1]);
+    int fd = _open_osfhandle(p->fhs[0], _O_RDONLY);
+    if (fd == -1)
+        return NULL;
+    FILE *in = _fdopen(, "r");
+#else
     close(p->fds[1]);
     FILE *in = fdopen(p->fds[0], "r");
+#endif
+    if (!in)
+        return NULL;
+
     setvbuf(in, NULL, _IONBF, 0);
     return in;
 }
 
 FILE *pipe_out(s_pipe_handle *p) {
+#ifdef _WIN32
+    CloseHandle(p->fhs[0]);
+    int fd = _open_osfhandle(p->fhs[1], _O_WRONLY);
+    if (fd == -1)
+        return NULL;
+    FILE *out = _fdopen(fd, "w");
+#else
     close(p->fds[0]);
     FILE *out = fdopen(p->fds[1], "w");
+#endif
+    if (!out)
+        return NULL;
+
     setvbuf(out, NULL, _IONBF, 0);
     return out;
 }
 
 s_pipe_handle *stdpipe() {
 #ifdef _WIN32
-    // TODO
+    HANDLE fhs[2];
+    if (!CreatePipe(fhs, fhs + 1, NULL, 0))
+        return NULL;
+    return unique_ptr(s_pipe_handle, {{ fhs[0], fhs[1] }});
 #else
     int fds[2] = { -1, -1 };
     if (pipe(fds) == -1)
diff --git a/src/posix-compat.h b/src/posix-compat.h
index 83567f8..8f53627 100644
--- a/src/posix-compat.h
+++ b/src/posix-compat.h
@@ -1,9 +1,15 @@
 #ifndef POSIX_COMPAT_H_
 # define POSIX_COMPAT_H_
 
-# define _POSIX_SOURCE 1
+# if !defined(_POSIX_SOURCE)
+#  define _POSIX_SOURCE 1
+#  define TMP_POSIX
+# endif
 # include <stdio.h>
-# undef _POSIX_SOURCE
+# ifdef TMP_POSIX
+#  undef _POSIX_SOURCE
+#  undef TMP_POSIX
+# endif
 
 # ifdef _WIN32
 #  define WEXITSTATUS(Status)    (((Status) & 0xFF00) >> 8)