diff --git a/cpython-unix/build-sqlite.sh b/cpython-unix/build-sqlite.sh
index 596ceae9..780e8270 100755
--- a/cpython-unix/build-sqlite.sh
+++ b/cpython-unix/build-sqlite.sh
@@ -28,6 +28,7 @@ fi
 unset CXX
 
 CC_FOR_BUILD="${HOST_CC}" \
+# Please try to keep these in sync with cpython-windows/build.py
 CFLAGS="${EXTRA_TARGET_CFLAGS} \
     -DSQLITE_ENABLE_DBSTAT_VTAB \
     -DSQLITE_ENABLE_FTS3 \
diff --git a/cpython-windows/build.py b/cpython-windows/build.py
index 26023247..f8902132 100644
--- a/cpython-windows/build.py
+++ b/cpython-windows/build.py
@@ -568,6 +568,36 @@ def hack_project_files(
         rb"<SqlitePatchVersion>%s</SqlitePatchVersion>" % sqlite3_version_parts[3],
     )
 
+    # Please try keep these in sync with cpython-unix/build-sqlite.sh
+    sqlite_build_flags = {
+        b"SQLITE_ENABLE_DBSTAT_VTAB",
+        b"SQLITE_ENABLE_FTS3",
+        b"SQLITE_ENABLE_FTS3_PARENTHESIS",
+        b"SQLITE_ENABLE_FTS4",
+        b"SQLITE_ENABLE_FTS5",
+        b"SQLITE_ENABLE_GEOPOLY",
+        b"SQLITE_ENABLE_RTREE",
+    }
+    with sqlite3_path.open("rb") as fh:
+        data = fh.read()
+    sqlite_preprocessor_regex = (
+        rb"<PreprocessorDefinitions>(SQLITE_ENABLE.*)</PreprocessorDefinitions>"
+    )
+    m = re.search(sqlite_preprocessor_regex, data)
+    if m is None:
+        raise NoSearchStringError(
+            "search string (%s) not in %s" % (sqlite_preprocessor_regex, sqlite3_path)
+        )
+    current_flags = set(m.group(1).split(b";"))
+    data = (
+        data[: m.start(1)]
+        + b";".join(sqlite_build_flags - current_flags)
+        + b";"
+        + data[m.start(1) :]
+    )
+    with sqlite3_path.open("wb") as fh:
+        fh.write(data)
+
     # Our version of the xz sources is newer than what's in cpython-source-deps
     # and the xz sources changed the path to config.h. Hack the project file
     # accordingly.
diff --git a/src/verify_distribution.py b/src/verify_distribution.py
index 16901883..9968606f 100644
--- a/src/verify_distribution.py
+++ b/src/verify_distribution.py
@@ -123,15 +123,8 @@ def test_sqlite(self):
         self.assertTrue(hasattr(conn, "enable_load_extension"))
         # Backup feature requires modern SQLite, which we always have.
         self.assertTrue(hasattr(conn, "backup"))
-        # Ensure that various extensions are present. These will raise if they are not. Note that
-        # CPython upstream carries configuration flags for the Windows build, so geopoly is missing
-        # on all versions and rtree is missing in 3.9. On non-Windows platforms, we configure
-        # SQLite ourselves. We might want to patch the build to enable these on Windows, see #666.
-        extensions = ["fts3", "fts4", "fts5"]
-        if os.name != "nt":
-            extensions.append("geopoly")
-        if os.name != "nt" or sys.version_info[0:2] > (3, 9):
-            extensions.append("rtree")
+        # Ensure that various extensions are present. These will raise if they are not.
+        extensions = ["fts3", "fts4", "fts5", "geopoly", "rtree"]
         cursor = conn.cursor()
         for extension in extensions:
             with self.subTest(extension=extension):