diff --git a/src/PSOProtocol.hh b/src/PSOProtocol.hh
index e2a85f7c..e95670e1 100644
--- a/src/PSOProtocol.hh
+++ b/src/PSOProtocol.hh
@@ -120,6 +120,12 @@ T& check_size_t(void* data, size_t size) {
   return check_size_generic<T, void*>(data, size, sizeof(T), sizeof(T));
 }
 
+template <typename T>
+T* check_size_vec_t(std::string& data, size_t count) {
+  size_t expected_size = count * sizeof(T);
+  return &check_size_generic<T, void*>(data.data(), data.size(), expected_size, expected_size);
+}
+
 void check_size_v(size_t size, size_t min_size, size_t max_size = 0);
 
 std::string prepend_command_header(
diff --git a/src/SaveFileFormats.hh b/src/SaveFileFormats.hh
index a45547c5..9713dd62 100644
--- a/src/SaveFileFormats.hh
+++ b/src/SaveFileFormats.hh
@@ -14,6 +14,7 @@
 #include "Episode3/DataIndexes.hh"
 #include "ItemNameIndex.hh"
 #include "PSOEncryption.hh"
+#include "PSOProtocol.hh"
 #include "PlayerSubordinates.hh"
 #include "Text.hh"