diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index e6cfc65..01effbf 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -808,7 +808,6 @@ if(WIN32)
 	set(EXTRA_EXPORT ${EXTRA_EXPORT} posix_write)
 	set(EXTRA_EXPORT ${EXTRA_EXPORT} posix_getsockopt)
 	set(EXTRA_EXPORT ${EXTRA_EXPORT} posix_setsockopt)
-	set(EXTRA_EXPORT ${EXTRA_EXPORT} sleep)
 endif()
 
 if(NOT HAVE_ASPRINTF)
diff --git a/crypto/compat/posix_win.c b/crypto/compat/posix_win.c
index 4b4b5f5..30c93cd 100644
--- a/crypto/compat/posix_win.c
+++ b/crypto/compat/posix_win.c
@@ -242,10 +242,4 @@ int gettimeofday(struct timeval * tp, struct timezone * tzp)
 	return 0;
 }
 
-unsigned int sleep(unsigned int seconds)
-{
-	Sleep(seconds * 1000);
-	return seconds;
-}
-
 #endif
diff --git a/include/compat/unistd.h b/include/compat/unistd.h
index f521b94..4c4df10 100644
--- a/include/compat/unistd.h
+++ b/include/compat/unistd.h
@@ -37,7 +37,13 @@ ssize_t pwrite(int d, const void *buf, size_t nbytes, off_t offset);
 
 #define access _access
 
-unsigned int sleep(unsigned int seconds);
+#ifdef _MSC_VER
+static inline unsigned int sleep(unsigned int seconds)
+{
+       Sleep(seconds * 1000);
+       return seconds;
+}
+#endif
 
 int ftruncate(int fd, off_t length);
 uid_t getuid(void);