diff --git a/include/PacketBuffer/Serializer/Std/String.h b/include/PacketBuffer/Serializer/Std/String.h
index c3fcadf..b5a41ff 100644
--- a/include/PacketBuffer/Serializer/Std/String.h
+++ b/include/PacketBuffer/Serializer/Std/String.h
@@ -87,7 +87,7 @@ namespace PacketBuffer {
 			uint64_t length;
 			unpacker(length);
 
-			string.resize(length);
+			string.resize((size_t) length);
 			unpacker.unpack(&string[0], string.size());
 		}
 	};
diff --git a/include/PacketBuffer/Serializer/Std/Vector.h b/include/PacketBuffer/Serializer/Std/Vector.h
index 29f797d..8f31b7f 100644
--- a/include/PacketBuffer/Serializer/Std/Vector.h
+++ b/include/PacketBuffer/Serializer/Std/Vector.h
@@ -71,7 +71,7 @@ namespace PacketBuffer {
 			uint64_t items;
 			unpacker(items);
 
-			vector.resize(items);
+			vector.resize((size_t) items);
 			for(int i = 0; i < items; i++) {
 				unpacker(vector[i]);
 			}