diff --git a/examples/ThirdPartyLibs/optionalX11/X11/Xmd.h b/examples/ThirdPartyLibs/optionalX11/X11/Xmd.h
index c74815a91..874f55108 100644
--- a/examples/ThirdPartyLibs/optionalX11/X11/Xmd.h
+++ b/examples/ThirdPartyLibs/optionalX11/X11/Xmd.h
@@ -63,7 +63,8 @@ SOFTWARE.
 	defined(__sparc64__) ||                   \
 	defined(__s390x__) ||                     \
 	defined(__amd64__) || defined(amd64) ||   \
-	defined(__powerpc64__)
+	defined(__powerpc64__) ||                 \
+	defined(__e2k__)
 #if !defined(__ILP32__) /* amd64-x32 is 32bit */
 #define LONG64          /* 32/64-bit architecture */
 #endif                  /* !__ILP32__ */