diff --git a/legacy/eio/configure.ac b/legacy/eio/configure.ac
index 8a26c2b556..c267b05294 100644
--- a/legacy/eio/configure.ac
+++ b/legacy/eio/configure.ac
@@ -97,6 +97,14 @@ AC_C___ATTRIBUTE__
 AC_PROG_CC_STDC
 AM_PROG_CC_C_O
 
+EFL_EIO_BUILD=""
+case "$host_os" in
+   mingw*)
+      EFL_EIO_BUILD="-DEFL_EIO_BUILD"
+   ;;
+esac
+AC_SUBST(EFL_EIO_BUILD)
+
 ### Checks for library functions
 AC_FUNC_ALLOCA
 AC_CHECK_FUNCS(strlcpy)
diff --git a/legacy/eio/src/lib/Makefile.am b/legacy/eio/src/lib/Makefile.am
index 11a60e882f..5729bf7ea6 100644
--- a/legacy/eio/src/lib/Makefile.am
+++ b/legacy/eio/src/lib/Makefile.am
@@ -1,6 +1,7 @@
 MAINTAINERCLEANFILES = Makefile.in
 
-AM_CPPFLAGS = @EIO_CFLAGS@
+AM_CPPFLAGS = @EIO_CFLAGS@ \
+@EFL_EIO_BUILD@
 AM_CFLAGS = @EIO_CFLAGS@
 
 lib_LTLIBRARIES = libeio.la