diff --git a/Include/pyport.h b/Include/pyport.h
index b1b2a74779691d..22085049a30487 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -726,4 +726,10 @@ extern char * _getpty(int *, int, mode_t, int);
# endif
#endif
+
+/* AIX has __bool__ redefined in it's system header file. */
+#if defined(_AIX) && defined(__bool__)
+#undef __bool__
+#endif
+
#endif /* Py_PYPORT_H */
diff --git a/Misc/NEWS.d/next/Build/2022-10-27-09-57-12.gh-issue-98705.H11XmR.rst b/Misc/NEWS.d/next/Build/2022-10-27-09-57-12.gh-issue-98705.H11XmR.rst
new file mode 100644
index 00000000000000..4519853cdbadd1
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2022-10-27-09-57-12.gh-issue-98705.H11XmR.rst
@@ -0,0 +1,2 @@
+``__bool__`` is defined in AIX system header files which breaks the build in
+AIX, so undefine it.
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