diff --git a/embed/build.sh b/embed/build.sh
index c50112c..54aa170 100755
--- a/embed/build.sh
+++ b/embed/build.sh
@@ -20,6 +20,7 @@ WASI_SDK="$ROOT/tools/wasi-sdk-22.0/bin"
 	-Wl,--stack-first \
 	-Wl,--import-undefined \
 	-D_HAVE_SQLITE_CONFIG_H \
+	-DSQLITE_CUSTOM_INCLUDE=sqlite_opt.h \
 	$(awk '{print "-Wl,--export="$0}' exports.txt)
 
 trap 'rm -f sqlite3.tmp' EXIT
diff --git a/sqlite3/sqlite_cfg.h b/sqlite3/sqlite_cfg.h
index 7da18b3..524cc72 100644
--- a/sqlite3/sqlite_cfg.h
+++ b/sqlite3/sqlite_cfg.h
@@ -33,52 +33,10 @@
 #define HAVE_MALLOC_H 1
 #define HAVE_MALLOC_USABLE_SIZE 1
 
-// Recommended Options
-
-#define SQLITE_DQS 0
-#define SQLITE_THREADSAFE 0
-#define SQLITE_DEFAULT_MEMSTATUS 0
-#define SQLITE_DEFAULT_WAL_SYNCHRONOUS 1
-#define SQLITE_LIKE_DOESNT_MATCH_BLOBS
-#define SQLITE_MAX_EXPR_DEPTH 0
-#define SQLITE_STRICT_SUBTYPE 1
-#define SQLITE_USE_ALLOCA
-#define SQLITE_OMIT_DEPRECATED
-#define SQLITE_OMIT_SHARED_CACHE
-#define SQLITE_OMIT_AUTOINIT
-// #define SQLITE_OMIT_DECLTYPE
-// #define SQLITE_OMIT_PROGRESS_CALLBACK
-
-// Other Options
-
-#define SQLITE_ALLOW_URI_AUTHORITY
-#define SQLITE_TRUSTED_SCHEMA 0
-#define SQLITE_DEFAULT_FOREIGN_KEYS 1
-#define SQLITE_ENABLE_ATOMIC_WRITE
-#define SQLITE_ENABLE_BATCH_ATOMIC_WRITE
-
 // Because Wasm does not support shared memory,
 // SQLite disables WAL for Wasm builds.
-// We patch SQLite to use exclusive locking mode instead.
-// https://sqlite.org/wal.html#noshm
+// But we want it.
 #undef SQLITE_OMIT_WAL
 
-// We have our own memdb VFS.
-// To avoid interactions between the two,
-// omit sqlite3_serialize/sqlite3_deserialize,
-// which we also don't wrap.
-#define SQLITE_OMIT_DESERIALIZE
-
-// Amalgamated Extensions
-
-#define SQLITE_ENABLE_MATH_FUNCTIONS 1
-#define SQLITE_ENABLE_JSON1 1
-#define SQLITE_ENABLE_FTS5 1
-#define SQLITE_ENABLE_RTREE 1
-#define SQLITE_ENABLE_GEOPOLY 1
-
-#define SQLITE_SOUNDEX
-#define SQLITE_UNTESTABLE
-
 // Implemented in vfs.c.
 int localtime_s(struct tm *const pTm, time_t const *const pTime);
\ No newline at end of file
diff --git a/sqlite3/sqlite_opt.h b/sqlite3/sqlite_opt.h
new file mode 100644
index 0000000..199a142
--- /dev/null
+++ b/sqlite3/sqlite_opt.h
@@ -0,0 +1,42 @@
+// Recommended Options
+
+#define SQLITE_DQS 0
+#define SQLITE_THREADSAFE 0
+#define SQLITE_DEFAULT_MEMSTATUS 0
+#define SQLITE_DEFAULT_WAL_SYNCHRONOUS 1
+#define SQLITE_LIKE_DOESNT_MATCH_BLOBS
+#define SQLITE_MAX_EXPR_DEPTH 0
+#define SQLITE_STRICT_SUBTYPE 1
+#define SQLITE_USE_ALLOCA
+#define SQLITE_OMIT_DEPRECATED
+#define SQLITE_OMIT_SHARED_CACHE
+#define SQLITE_OMIT_AUTOINIT
+
+// We need these:
+// #define SQLITE_OMIT_DECLTYPE
+// #define SQLITE_OMIT_PROGRESS_CALLBACK
+
+// Other Options
+
+#define SQLITE_ALLOW_URI_AUTHORITY
+#define SQLITE_TRUSTED_SCHEMA 0
+#define SQLITE_DEFAULT_FOREIGN_KEYS 1
+#define SQLITE_ENABLE_ATOMIC_WRITE
+#define SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+
+// We have our own memdb VFS.
+// To avoid interactions between the two,
+// omit sqlite3_serialize/sqlite3_deserialize,
+// which we also don't wrap.
+#define SQLITE_OMIT_DESERIALIZE
+
+// Amalgamated Extensions
+
+#define SQLITE_ENABLE_MATH_FUNCTIONS 1
+#define SQLITE_ENABLE_JSON1 1
+#define SQLITE_ENABLE_FTS5 1
+#define SQLITE_ENABLE_RTREE 1
+#define SQLITE_ENABLE_GEOPOLY 1
+
+#define SQLITE_SOUNDEX
+#define SQLITE_UNTESTABLE
\ No newline at end of file
diff --git a/vfs/tests/mptest/testdata/build.sh b/vfs/tests/mptest/testdata/build.sh
index c6fb46f..598a19d 100755
--- a/vfs/tests/mptest/testdata/build.sh
+++ b/vfs/tests/mptest/testdata/build.sh
@@ -21,6 +21,7 @@ WASI_SDK="$ROOT/tools/wasi-sdk-22.0/bin"
 	-DSQLITE_DEFAULT_LOCKING_MODE=0 \
 	-DSQLITE_NO_SYNC -DSQLITE_THREADSAFE=0 \
 	-DSQLITE_OMIT_LOAD_EXTENSION -DHAVE_USLEEP \
+	-DSQLITE_CUSTOM_INCLUDE=sqlite_opt.h \
 	-D_WASI_EMULATED_GETPID -lwasi-emulated-getpid \
 	$(awk '{print "-Wl,--export="$0}' exports.txt)
 
diff --git a/vfs/tests/speedtest1/testdata/build.sh b/vfs/tests/speedtest1/testdata/build.sh
index 875daf6..061ae52 100755
--- a/vfs/tests/speedtest1/testdata/build.sh
+++ b/vfs/tests/speedtest1/testdata/build.sh
@@ -17,6 +17,7 @@ WASI_SDK="$ROOT/tools/wasi-sdk-22.0/bin"
 	-Wl,--stack-first \
 	-Wl,--import-undefined \
 	-D_HAVE_SQLITE_CONFIG_H -DSQLITE_USE_URI \
+	-DSQLITE_CUSTOM_INCLUDE=sqlite_opt.h \
 	$(awk '{print "-Wl,--export="$0}' exports.txt)
 
 "$BINARYEN/wasm-opt" -g --strip --strip-producers -c -O3 \