diff --git a/include/binder/Parcel.h b/include/binder/Parcel.h
index 98b9835..14fd002 100644
--- a/include/binder/Parcel.h
+++ b/include/binder/Parcel.h
@@ -531,7 +531,10 @@
 status_t Parcel::write(const LightFlattenable<T>& val) {
     size_t size(val.getFlattenedSize());
     if (!val.isFixedSize()) {
-        status_t err = writeInt32(size);
+        if (size > INT32_MAX) {
+            return BAD_VALUE;
+        }
+        status_t err = writeInt32(static_cast<int32_t>(size));
         if (err != NO_ERROR) {
             return err;
         }
@@ -562,7 +565,7 @@
         if (err != NO_ERROR) {
             return err;
         }
-        size = s;
+        size = static_cast<size_t>(s);
     }
     if (size) {
         void const* buffer = readInplace(size);
@@ -577,7 +580,7 @@
     if (val.size() > INT32_MAX) {
         return BAD_VALUE;
     }
-    return writeInt32(val.size());
+    return writeInt32(static_cast<int32_t>(val.size()));
 }
 
 template<typename T>
@@ -667,7 +670,7 @@
         return UNEXPECTED_NULL;
     }
 
-    val->resize(size);
+    val->resize(static_cast<size_t>(size));
 
     for (auto& v: *val) {
         status = (this->*read_func)(&v);
@@ -689,7 +692,7 @@
 template<typename T>
 status_t Parcel::readNullableTypedVector(std::unique_ptr<std::vector<T>>* val,
                                          status_t(Parcel::*read_func)(T*) const) const {
-    const int32_t start = dataPosition();
+    const size_t start = dataPosition();
     int32_t size;
     status_t status = readInt32(&size);
     val->reset();
@@ -717,7 +720,7 @@
         return BAD_VALUE;
     }
 
-    status_t status = this->writeInt32(val.size());
+    status_t status = this->writeInt32(static_cast<int32_t>(val.size()));
 
     if (status != OK) {
         return status;
@@ -773,7 +776,7 @@
 
 template<typename T>
 status_t Parcel::readParcelableVector(std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const {
-    const int32_t start = dataPosition();
+    const size_t start = dataPosition();
     int32_t size;
     status_t status = readInt32(&size);
     val->reset();
@@ -796,7 +799,7 @@
 
 template<typename T>
 status_t Parcel::readParcelable(std::unique_ptr<T>* parcelable) const {
-    const int32_t start = dataPosition();
+    const size_t start = dataPosition();
     int32_t present;
     status_t status = readInt32(&present);
     parcelable->reset();