diff --git a/Misc/NEWS.d/next/Build/2024-03-04-12-43-42.gh-issue-116313.cLLb8S.rst b/Misc/NEWS.d/next/Build/2024-03-04-12-43-42.gh-issue-116313.cLLb8S.rst
new file mode 100644
index 00000000000000..61501549060024
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2024-03-04-12-43-42.gh-issue-116313.cLLb8S.rst
@@ -0,0 +1 @@
+Get WASI builds to work under wasmtime 18 w/ WASI 0.2/preview2 primitives.
diff --git a/Tools/wasm/wasm_build.py b/Tools/wasm/wasm_build.py
index 63812c6f3153f2..78c749b8803868 100755
--- a/Tools/wasm/wasm_build.py
+++ b/Tools/wasm/wasm_build.py
@@ -316,8 +316,10 @@ def _check_wasi():
         # workaround for https://github.com/python/cpython/issues/95952
         "HOSTRUNNER": (
             "wasmtime run "
-            "--env PYTHONPATH=/{relbuilddir}/build/lib.wasi-wasm32-{version}:/Lib "
-            "--mapdir /::{srcdir} --"
+            "--wasm max-wasm-stack=8388608 "
+            "--wasi preview2 "
+            "--dir {srcdir}::/ "
+            "--env PYTHONPATH=/{relbuilddir}/build/lib.wasi-wasm32-{version}:/Lib"
         ),
         "PATH": [WASI_SDK_PATH / "bin", os.environ["PATH"]],
     },
diff --git a/configure b/configure
index cb3db60f9c2322..a1ad0ae25101cd 100755
--- a/configure
+++ b/configure
@@ -6961,7 +6961,7 @@ fi
 fi
      ;; #(
               WASI/*) :
-    HOSTRUNNER='wasmtime run --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt) --mapdir /::$(srcdir) --' ;; #(
+    HOSTRUNNER='wasmtime run --wasm max-wasm-stack=8388608 --wasi preview2 --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt):/Lib --dir $(srcdir)::/' ;; #(
   *) :
     HOSTRUNNER=''
    ;;
diff --git a/configure.ac b/configure.ac
index bbe7f891e7dd29..7b4000fa9c340d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1580,7 +1580,7 @@ then
     dnl TODO: support other WASI runtimes
     dnl wasmtime starts the proces with "/" as CWD. For OOT builds add the
     dnl directory containing _sysconfigdata to PYTHONPATH.
-    [WASI/*], [HOSTRUNNER='wasmtime run --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt) --mapdir /::$(srcdir) --'],
+    [WASI/*], [HOSTRUNNER='wasmtime run --wasm max-wasm-stack=8388608 --wasi preview2 --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt):/Lib --dir $(srcdir)::/'],
     [HOSTRUNNER='']
   )
 fi