diff --git a/source/h5vol/CMakeLists.txt b/source/h5vol/CMakeLists.txt
index c94593a70e..e8c2ce4461 100644
--- a/source/h5vol/CMakeLists.txt
+++ b/source/h5vol/CMakeLists.txt
@@ -9,6 +9,18 @@ if(CMAKE_C_COMPILER_ID MATCHES "^(GNU)$")
   string(APPEND CMAKE_C_FLAGS " -Wno-format-zero-length")
 endif()
 
+include(CheckIncludeFiles)
+check_include_files(unistd.h HAVE_UNISTD_H)
+check_include_files(windows.h HAVE_WINDOWS_H)
+
+if (HAVE_UNISTD_H)
+   add_definitions(-DHAVE_UNISTD_H)
+endif()
+
+if (HAVE_WINDOWS_H)
+   add_definitions(-DHAVE_WINDOWS_H)
+endif()
+
 add_library(adios2_h5vol
   H5VolReadWrite.c
   H5Vol.c
diff --git a/source/h5vol/H5VolReadWrite.c b/source/h5vol/H5VolReadWrite.c
index f049d9ad85..5633eaf03d 100644
--- a/source/h5vol/H5VolReadWrite.c
+++ b/source/h5vol/H5VolReadWrite.c
@@ -16,7 +16,14 @@
 #include "H5VolReadWrite.h"
 
 #include "H5VolUtil.h"
+
+#ifdef HAVE_UNISTD_H
 #include <unistd.h> // sleep
+#elif defined HAVE_WINDOWS_H
+#include <windows.h>
+#define sleep(x) Sleep(1000 * (x))
+#endif
+
 // these are in h5private.h
 #define SUCCEED 1
 #define FAIL 0