diff --git a/sqlite-vec.c b/sqlite-vec.c
index c2dfee9..e2944ee 100644
--- a/sqlite-vec.c
+++ b/sqlite-vec.c
@@ -3608,7 +3608,7 @@ int vec0_rowids_insert_rowid(vec0_vtab *p, i64 rowid) {
     }
   }
 
-#ifdef SQLITE_THREADSAFE
+#if SQLITE_THREADSAFE
   if (sqlite3_mutex_enter) {
     sqlite3_mutex_enter(sqlite3_db_mutex(p->db));
     entered = 1;
@@ -3640,7 +3640,7 @@ int vec0_rowids_insert_rowid(vec0_vtab *p, i64 rowid) {
     sqlite3_clear_bindings(p->stmtRowidsInsertRowid);
   }
 
-#ifdef SQLITE_THREADSAFE
+#if SQLITE_THREADSAFE
   if (sqlite3_mutex_leave && entered) {
     sqlite3_mutex_leave(sqlite3_db_mutex(p->db));
   }
@@ -3670,7 +3670,7 @@ int vec0_rowids_insert_id(vec0_vtab *p, sqlite3_value *idValue, i64 *rowid) {
     }
   }
 
-#ifdef SQLITE_THREADSAFE
+#if SQLITE_THREADSAFE
   if (sqlite3_mutex_enter) {
     sqlite3_mutex_enter(sqlite3_db_mutex(p->db));
     entered = 1;
@@ -3707,7 +3707,7 @@ int vec0_rowids_insert_id(vec0_vtab *p, sqlite3_value *idValue, i64 *rowid) {
     sqlite3_clear_bindings(p->stmtRowidsInsertId);
   }
 
-#ifdef SQLITE_THREADSAFE
+#if SQLITE_THREADSAFE
   if (sqlite3_mutex_leave && entered) {
     sqlite3_mutex_leave(sqlite3_db_mutex(p->db));
   }
@@ -3795,7 +3795,7 @@ int vec0_new_chunk(vec0_vtab *p, i64 *chunk_rowid) {
     return rc;
   }
 
-#ifdef SQLITE_THREADSAFE
+#if SQLITE_THREADSAFE
   if (sqlite3_mutex_enter) {
     sqlite3_mutex_enter(sqlite3_db_mutex(p->db));
   }
@@ -3808,7 +3808,7 @@ int vec0_new_chunk(vec0_vtab *p, i64 *chunk_rowid) {
   rc = sqlite3_step(stmt);
   int failed = rc != SQLITE_DONE;
   rowid = sqlite3_last_insert_rowid(p->db);
-#ifdef SQLITE_THREADSAFE
+#if SQLITE_THREADSAFE
   if (sqlite3_mutex_leave) {
     sqlite3_mutex_leave(sqlite3_db_mutex(p->db));
   }
diff --git a/tests/minimum/Makefile b/tests/minimum/Makefile
index 7c86851..76a6f1e 100644
--- a/tests/minimum/Makefile
+++ b/tests/minimum/Makefile
@@ -1,27 +1,37 @@
-#curl -q -o sqlite-amalgamation-3310100.zip https://www.sqlite.org/2020/sqlite-amalgamation-3310100.zip
-#unzip https://www.sqlite.org/2020/sqlite-amalgamation-3310100.zip
-
-dist/:
+dist/.stammp:
 	mkdir -p dist
 	touch $@
 
-dist/sqlite-amalgamation-3310100: dist/
-	rm -rf sqlite-amalgamation-3310100/ || true
+dist/sqlite-amalgamation-3310100/.stamp: dist/.stammp
+	rm -rf dist/sqlite-amalgamation-3310100/ || true
 	curl -q -o sqlite-amalgamation-3310100.zip https://www.sqlite.org/2020/sqlite-amalgamation-3310100.zip
 	unzip -d dist/ sqlite-amalgamation-3310100.zip
 	rm sqlite-amalgamation-3310100.zip
 	touch $@
 
-dist/t3310100: demo.c dist/sqlite-amalgamation-3310100
+dist/t3310100: demo.c dist/sqlite-amalgamation-3310100/.stamp ../../sqlite-vec.c
+	gcc \
+		-lm \
+		-DSQLITE_CORE -DSQLITE_ENABLE_JSON1 \
+		-I dist/sqlite-amalgamation-3310100 \
+		-I ../../ \
+		$< dist/sqlite-amalgamation-3310100/sqlite3.c \
+		../../sqlite-vec.c \
+		-o $@
+
+dist/t3310100-threadsafe: demo.c dist/sqlite-amalgamation-3310100/.stamp ../../sqlite-vec.c
 	gcc \
 		-lm \
-		-DSQLITE_CORE \
+		-DSQLITE_CORE -DSQLITE_ENABLE_JSON1 -DSQLITE_THREADSAFE=0 \
 		-I dist/sqlite-amalgamation-3310100 \
 		-I ../../ \
 		$< dist/sqlite-amalgamation-3310100/sqlite3.c \
 		../../sqlite-vec.c \
 		-o $@
 
-test:
-	make dist/t3310100
+test: dist/t3310100 dist/t3310100-threadsafe
 	./dist/t3310100
+	./dist/t3310100-threadsafe
+
+clean:
+	rm -rf dist/
diff --git a/tests/minimum/demo.c b/tests/minimum/demo.c
index d67b10d..7faebfa 100644
--- a/tests/minimum/demo.c
+++ b/tests/minimum/demo.c
@@ -9,17 +9,18 @@ int main(int argc, char *argv[]) {
   sqlite3 *db;
   sqlite3_stmt *stmt;
 
-  rc = sqlite3_auto_extension((void (*)())sqlite3_vec_init);
+  rc = sqlite3_open(":memory:", &db);
   assert(rc == SQLITE_OK);
 
-  rc = sqlite3_open(":memory:", &db);
+  rc = sqlite3_vec_init(db, NULL, NULL);
   assert(rc == SQLITE_OK);
 
-  rc = sqlite3_prepare_v2(db, "SELECT sqlite_version(), vec_version()", -1, &stmt, NULL);
+
+  rc = sqlite3_prepare_v2(db, "SELECT sqlite_version(), vec_version(), (select json_group_array(compile_options) from pragma_compile_options)", -1, &stmt, NULL);
   assert(rc == SQLITE_OK);
 
   rc = sqlite3_step(stmt);
-  printf("sqlite_version=%s, vec_version=%s\n", sqlite3_column_text(stmt, 0), sqlite3_column_text(stmt, 1));
+  printf("sqlite_version=%s, vec_version=%s %s\n", sqlite3_column_text(stmt, 0), sqlite3_column_text(stmt, 1), sqlite3_column_text(stmt, 2));
   sqlite3_finalize(stmt);
   sqlite3_close(db);
   return 0;