diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-11-17-16-49-32.gh-issue-111807.QvjP9_.rst b/Misc/NEWS.d/next/Core and Builtins/2023-11-17-16-49-32.gh-issue-111807.QvjP9_.rst
new file mode 100644
index 00000000000..6f075845e11
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2023-11-17-16-49-32.gh-issue-111807.QvjP9_.rst	
@@ -0,0 +1 @@
+Lower the max parser stack depth to 1000 under WASI debug builds.
diff --git a/Parser/parser.c b/Parser/parser.c
index ca8e9d0e236..d27ddd3d3e3 100644
--- a/Parser/parser.c
+++ b/Parser/parser.c
@@ -8,7 +8,11 @@
 #endif
 
 #ifdef __wasi__
-#  define MAXSTACK 4000
+#  ifdef Py_DEBUG
+#    define MAXSTACK 1000
+#  else
+#    define MAXSTACK 4000
+#  endif
 #else
 #  define MAXSTACK 6000
 #endif
diff --git a/Tools/peg_generator/pegen/c_generator.py b/Tools/peg_generator/pegen/c_generator.py
index 301949bdae9..7cdd5debe9a 100644
--- a/Tools/peg_generator/pegen/c_generator.py
+++ b/Tools/peg_generator/pegen/c_generator.py
@@ -38,7 +38,11 @@ EXTENSION_PREFIX = """\
 #endif
 
 #ifdef __wasi__
-#  define MAXSTACK 4000
+#  ifdef Py_DEBUG
+#    define MAXSTACK 1000
+#  else
+#    define MAXSTACK 4000
+#  endif
 #else
 #  define MAXSTACK 6000
 #endif