diff --git a/legacy/eet/configure.ac b/legacy/eet/configure.ac
index 653100661f..95eb99d199 100644
--- a/legacy/eet/configure.ac
+++ b/legacy/eet/configure.ac
@@ -352,7 +352,7 @@ AC_CHECK_HEADER([jpeglib.h],
    [dummy="yes"],
    [AC_MSG_ERROR("Cannot find jpeglib.h. Make sure your CFLAGS environment variable contains include lines for the location of this file")])
 
-AC_CHECK_HEADERS(netinet/in.h)
+AC_CHECK_HEADERS([netinet/in.h unistd.h])
 EFL_CHECK_PATH_MAX
 
 ### Checks for types
diff --git a/legacy/eet/src/lib/eet_cipher.c b/legacy/eet/src/lib/eet_cipher.c
index 6eff8de466..8c892d8241 100644
--- a/legacy/eet/src/lib/eet_cipher.c
+++ b/legacy/eet/src/lib/eet_cipher.c
@@ -25,9 +25,9 @@ void *    alloca (size_t);
 #include <sys/stat.h>
 #include <sys/mman.h>
 
-#ifndef _MSC_VER
+#ifdef HAVE_UNISTD_H
 # include <unistd.h>
-#endif /* ifndef _MSC_VER */
+#endif
 
 #ifdef HAVE_NETINET_IN_H
 # include <netinet/in.h>
diff --git a/legacy/eet/src/lib/eet_lib.c b/legacy/eet/src/lib/eet_lib.c
index d67c5e8da1..cd1019c766 100644
--- a/legacy/eet/src/lib/eet_lib.c
+++ b/legacy/eet/src/lib/eet_lib.c
@@ -34,9 +34,9 @@ void *    alloca (size_t);
 #include <fcntl.h>
 #include <zlib.h>
 
-#ifndef _MSC_VER
+#ifdef HAVE_UNISTD_H
 # include <unistd.h>
-#endif /* ifndef _MSC_VER */
+#endif
 
 #ifdef HAVE_NETINET_IN_H
 # include <netinet/in.h>