diff --git a/aegisub/libaegisub/common/log.cpp b/aegisub/libaegisub/common/log.cpp
index 34b400b92..46aace6b1 100644
--- a/aegisub/libaegisub/common/log.cpp
+++ b/aegisub/libaegisub/common/log.cpp
@@ -84,7 +84,9 @@ decltype(LogSink::messages) LogSink::GetMessages() const {
 	return ret;
 }
 
-Message::Message(const char *section, Severity severity, const char *file, const char *func, int line) {
+Message::Message(const char *section, Severity severity, const char *file, const char *func, int line)
+: msg(buffer, sizeof buffer)
+{
 	sm.section = section;
 	sm.severity = severity;
 	sm.file = file;
diff --git a/aegisub/libaegisub/include/libaegisub/log.h b/aegisub/libaegisub/include/libaegisub/log.h
index b87fd6032..3d6e72304 100644
--- a/aegisub/libaegisub/include/libaegisub/log.h
+++ b/aegisub/libaegisub/include/libaegisub/log.h
@@ -139,6 +139,7 @@ public:
 class Message {
 	std::ostrstream msg;
 	SinkMessage sm;
+	char buffer[2048];
 
 public:
 	Message(const char *section, Severity severity, const char *file, const char *func, int line);