diff --git a/src/ceval.h b/src/ceval.h
index 1b1a3e49..75bf82c0 100644
--- a/src/ceval.h
+++ b/src/ceval.h
@@ -55,7 +55,7 @@ PyVar VM::run_frame(Frame* frame){
             if(byte.op == OP_FAST_INDEX) frame->push(ref.get(this, frame));
             else frame->push(PyRef(ref));
         } continue;
-        case OP_ROT_TWO: std::swap(frame->top(), frame->top_1()); continue;
+        case OP_ROT_TWO: ::std::swap(frame->top(), frame->top_1()); continue;
         case OP_STORE_REF: {
             // PyVar obj = frame->pop_value(this);
             // PyVarRef r = frame->pop();
diff --git a/src/common.h b/src/common.h
index e0fd8afe..d5c2547b 100644
--- a/src/common.h
+++ b/src/common.h
@@ -26,6 +26,7 @@
 #include <map>
 #include <set>
 #include <algorithm>
+#include <fstream>
 
 #define PK_VERSION "0.9.1"
 
@@ -43,6 +44,8 @@ typedef double f64;
 
 namespace pkpy{
 
+namespace std = ::std;
+
 struct Dummy {  };
 struct DummyInstance {  };
 struct DummyModule { };
diff --git a/src/pocketpy.h b/src/pocketpy.h
index b5e58afd..3fd0d34d 100644
--- a/src/pocketpy.h
+++ b/src/pocketpy.h
@@ -615,7 +615,6 @@ void add_module_dis(VM* vm){
     });
 }
 
-#include <fstream>
 struct FileIO {
     PY_CLASS(io, FileIO)