diff --git a/src/ceval.h b/src/ceval.h
index 995bb5c0..7d7aec83 100644
--- a/src/ceval.h
+++ b/src/ceval.h
@@ -725,8 +725,10 @@ __NEXT_STEP:;
 /**********************************************************************/
             UNREACHABLE();
         }catch(HandledException& e){
+            PK_UNUSED(e);
             continue;
         }catch(UnhandledException& e){
+            PK_UNUSED(e);
             PyObject* obj = POPX();
             Exception& _e = CAST(Exception&, obj);
             _e.st_push(frame->snapshot());
@@ -742,6 +744,7 @@ __NEXT_STEP:;
             if(frame.index < base_id) throw ToBeRaisedException();
             need_raise = true;
         }catch(ToBeRaisedException& e){
+            PK_UNUSED(e);
             need_raise = true;
         }
     }
diff --git a/src/cffi.h b/src/cffi.h
index fee224a3..98bc8571 100644
--- a/src/cffi.h
+++ b/src/cffi.h
@@ -196,8 +196,8 @@ struct C99Struct{
     char* p;
     int size;
 
-    void _init(int size){
-        this->size = size;
+    void _init(int new_size){
+        this->size = new_size;
         if(size <= INLINE_SIZE){
             p = _inlined;
         }else{
diff --git a/src/config.h b/src/config.h
index 3e9523e5..339b74a6 100644
--- a/src/config.h
+++ b/src/config.h
@@ -66,9 +66,9 @@ namespace pkpy{
 
 #ifdef _MSC_VER
 #pragma warning (disable:4267)
-#pragma warning (disable:4101)
+#pragma warning (disable:4100)
 #pragma warning (disable:4244)
-#define _CRT_NONSTDC_NO_DEPRECATE
+#define strdup _strdup
 #endif
 
 #ifdef _MSC_VER
diff --git a/src/lexer.h b/src/lexer.h
index f5312c33..30ad2353 100644
--- a/src/lexer.h
+++ b/src/lexer.h
@@ -382,7 +382,8 @@ struct Lexer {
                 add_token(TK("@num"), Number::stoi(m[0], &size, base));
             }
             PK_ASSERT((int)size == (int)m.length());
-        }catch(std::exception& _){
+        }catch(std::exception& e){
+            PK_UNUSED(e);
             SyntaxError("invalid number literal");
         } 
     }