diff --git a/sipbuild/module/source/13/sip_core.c b/sipbuild/module/source/13/sip_core.c
index c72f13a..b4f97a4 100644
--- a/sipbuild/module/source/13/sip_core.c
+++ b/sipbuild/module/source/13/sip_core.c
@@ -245,7 +245,9 @@ static sipWrapperType sipWrapper_Type = {
         0,                  /* ht_name */
         0,                  /* ht_slots */
         0,                  /* ht_qualname */
+#ifndef PYPY_VERSION
         0,                  /* ht_cached_keys */
+#endif
 #if PY_VERSION_HEX >= 0x03090000
         0,                  /* ht_module */
 #endif
@@ -9696,7 +9698,9 @@ sipWrapperType sipSimpleWrapper_Type = {
         0,                  /* ht_name */
         0,                  /* ht_slots */
         0,                  /* ht_qualname */
+#ifndef PYPY_VERSION
         0,                  /* ht_cached_keys */
+#endif
 #if PY_VERSION_HEX >= 0x03090000
         0,                  /* ht_module */
 #endif