diff --git a/zion/object/thread.cpp b/zion/object/thread.cpp
index a1a1d47..fea38f9 100644
--- a/zion/object/thread.cpp
+++ b/zion/object/thread.cpp
@@ -51,6 +51,9 @@ Thread::Thread(Process& proc, uint64_t tid)
   if (reinterpret_cast<uint64_t>(fx_data_) & 0x8) {
     fx_data_ += 8;
   }
+  for (uint16_t i = 0; i < 512; i++) {
+    fx_data_[i] = 0;
+  }
 }
 
 uint64_t Thread::pid() const { return process_.id(); }