diff --git a/libsql-ffi/bundled/SQLite3MultipleCiphers/src/sqlite3.c b/libsql-ffi/bundled/SQLite3MultipleCiphers/src/sqlite3.c
index d9a19f55a1..988693f341 100644
--- a/libsql-ffi/bundled/SQLite3MultipleCiphers/src/sqlite3.c
+++ b/libsql-ffi/bundled/SQLite3MultipleCiphers/src/sqlite3.c
@@ -18394,7 +18394,14 @@ struct FuncDefHash {
 };
 #define SQLITE_FUNC_HASH(C,L) (((C)+(L))%SQLITE_FUNC_HASH_SZ)
 
-#if defined(SQLITE_USER_AUTHENTICATION)
+/* The #warning directive below is a hard error under MSVC's default
+** (traditional) C preprocessor (error C1021), which breaks Windows builds.
+** Keep the deprecation notice for compilers that accept #warning and skip it
+** on MSVC. This is purely a compile-time diagnostic; the extension itself is
+** still controlled by SQLITE_USER_AUTHENTICATION below. Upstream SQLite
+** removed this extension entirely in 3.48.0 (commit bc4df6079c), so this
+** local patch becomes moot once the bundled SQLite is updated past 3.47.0. */
+#if defined(SQLITE_USER_AUTHENTICATION) && !defined(_MSC_VER)
 # warning  "The SQLITE_USER_AUTHENTICATION extension is deprecated. \
  See ext/userauth/user-auth.txt for details."
 #endif
diff --git a/libsql-ffi/bundled/src/sqlite3.c b/libsql-ffi/bundled/src/sqlite3.c
index d9a19f55a1..988693f341 100644
--- a/libsql-ffi/bundled/src/sqlite3.c
+++ b/libsql-ffi/bundled/src/sqlite3.c
@@ -18394,7 +18394,14 @@ struct FuncDefHash {
 };
 #define SQLITE_FUNC_HASH(C,L) (((C)+(L))%SQLITE_FUNC_HASH_SZ)
 
-#if defined(SQLITE_USER_AUTHENTICATION)
+/* The #warning directive below is a hard error under MSVC's default
+** (traditional) C preprocessor (error C1021), which breaks Windows builds.
+** Keep the deprecation notice for compilers that accept #warning and skip it
+** on MSVC. This is purely a compile-time diagnostic; the extension itself is
+** still controlled by SQLITE_USER_AUTHENTICATION below. Upstream SQLite
+** removed this extension entirely in 3.48.0 (commit bc4df6079c), so this
+** local patch becomes moot once the bundled SQLite is updated past 3.47.0. */
+#if defined(SQLITE_USER_AUTHENTICATION) && !defined(_MSC_VER)
 # warning  "The SQLITE_USER_AUTHENTICATION extension is deprecated. \
  See ext/userauth/user-auth.txt for details."
 #endif
diff --git a/libsql-sqlite3/src/sqliteInt.h b/libsql-sqlite3/src/sqliteInt.h
index ac30f3ce5f..fbcc24cf71 100644
--- a/libsql-sqlite3/src/sqliteInt.h
+++ b/libsql-sqlite3/src/sqliteInt.h
@@ -1615,7 +1615,14 @@ struct FuncDefHash {
 };
 #define SQLITE_FUNC_HASH(C,L) (((C)+(L))%SQLITE_FUNC_HASH_SZ)
 
-#if defined(SQLITE_USER_AUTHENTICATION)
+/* The #warning directive below is a hard error under MSVC's default
+** (traditional) C preprocessor (error C1021), which breaks Windows builds.
+** Keep the deprecation notice for compilers that accept #warning and skip it
+** on MSVC. This is purely a compile-time diagnostic; the extension itself is
+** still controlled by SQLITE_USER_AUTHENTICATION below. Upstream SQLite
+** removed this extension entirely in 3.48.0 (commit bc4df6079c), so this
+** local patch becomes moot once the bundled SQLite is updated past 3.47.0. */
+#if defined(SQLITE_USER_AUTHENTICATION) && !defined(_MSC_VER)
 # warning  "The SQLITE_USER_AUTHENTICATION extension is deprecated. \
  See ext/userauth/user-auth.txt for details."
 #endif