diff --git a/libaegisub/common/format.cpp b/libaegisub/common/format.cpp
index 74cb4a6bf..829baa782 100644
--- a/libaegisub/common/format.cpp
+++ b/libaegisub/common/format.cpp
@@ -27,6 +27,11 @@
 #define WCHAR_T_ENC "utf-32le"
 #endif
 
+template class boost::interprocess::basic_vectorstream<std::string>;
+template class boost::interprocess::basic_vectorstream<std::wstring>;
+template class boost::interprocess::basic_vectorbuf<std::string>;
+template class boost::interprocess::basic_vectorbuf<std::wstring>;
+
 namespace {
 template<typename Char>
 int actual_len(int max_len, const Char *value) {
diff --git a/libaegisub/include/libaegisub/format.h b/libaegisub/include/libaegisub/format.h
index 790ba861a..b1ca50478 100644
--- a/libaegisub/include/libaegisub/format.h
+++ b/libaegisub/include/libaegisub/format.h
@@ -22,6 +22,11 @@
 
 class wxString;
 
+extern template class boost::interprocess::basic_vectorstream<std::string>;
+extern template class boost::interprocess::basic_vectorstream<std::wstring>;
+extern template class boost::interprocess::basic_vectorbuf<std::string>;
+extern template class boost::interprocess::basic_vectorbuf<std::wstring>;
+
 namespace agi { namespace format_detail {
 // A static cast which throws at runtime if the cast is invalid rather than
 // failing to compile, as with format strings we don't know what type to cast