diff --git a/Misc/NEWS.d/next/Library/2019-08-02-16-44-42.bpo-18049.OA4qBL.rst b/Misc/NEWS.d/next/Library/2019-08-02-16-44-42.bpo-18049.OA4qBL.rst
new file mode 100644
index 00000000000000..36a4de384cc08d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-08-02-16-44-42.bpo-18049.OA4qBL.rst
@@ -0,0 +1,3 @@
+Add definition of THREAD_STACK_SIZE for AIX in Python/thread_pthread.h
+The default thread stacksize caused crashes with the default recursion limit
+Patch by M Felt
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index 994e35b2cc0803..5678b05ced3698 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -47,6 +47,10 @@
#undef THREAD_STACK_SIZE
#define THREAD_STACK_SIZE 0x400000
#endif
+#if defined(_AIX) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
+#undef THREAD_STACK_SIZE
+#define THREAD_STACK_SIZE 0x200000
+#endif
/* for safety, ensure a viable minimum stacksize */
#define THREAD_STACK_MIN 0x8000 /* 32 KiB */
#else /* !_POSIX_THREAD_ATTR_STACKSIZE */
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