diff --git a/src/env.cpp b/src/env.cpp
index 1f6246008..fa47bf8f0 100644
--- a/src/env.cpp
+++ b/src/env.cpp
@@ -616,15 +616,11 @@ NAN_METHOD(EnvWrap::sync) {
         return Nan::ThrowError("The environment is already closed.");
     }
 
-    Nan::Callback* callback = new Nan::Callback(
-      v8::Local<v8::Function>::Cast(info[0])
-    );
-
-    SyncWorker* worker = new SyncWorker(
-      ew->env, callback
-    );
+    int rc = mdb_env_sync(ew->env, 1); // 1 = force
+    if (rc != 0) {
+        return Nan::ThrowError(mdb_strerror(rc));
+    }
 
-    Nan::AsyncQueueWorker(worker);
     return;
 }
 
diff --git a/src/kevel-patch.h b/src/kevel-patch.h
index 8fcd09493..ad7d19b0b 100644
--- a/src/kevel-patch.h
+++ b/src/kevel-patch.h
@@ -1,6 +1,8 @@
 #ifndef KEVEL_PATCH_H
 #define KEVEL_PATCH_H
 
-typedef uint64_t	mdb_size_t;
+#include <cstdint>
+
+typedef uint64_t mdb_size_t;
 
 #endif // KEVEL_PATCH_H