diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index e1a5a2f..836bafb 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -187,6 +187,10 @@
 #define Py_UNICODE_JOIN_SURROGATES(high, low)  \
     (((((Py_UCS4)(high) & 0x03FF) << 10) |      \
       ((Py_UCS4)(low) & 0x03FF)) + 0x10000)
+/* high surrogate = top 10 bits added to D800 */
+#define Py_UNICODE_HIGH_SURROGATE(ch) (0xD800 | (((ch) - 0x10000) >> 10))
+/* low surrogate = bottom 10 bits added to DC00 */
+#define Py_UNICODE_LOW_SURROGATE(ch) (0xDC00 | (((ch) - 0x10000) & 0x3FF))
 
 /* Check if substring matches at given offset.  The offset must be
    valid, and the substring must not be empty. */