diff --git a/Contrib/System/Source/System.c b/Contrib/System/Source/System.c
index 42f94533..a1153416 100644
--- a/Contrib/System/Source/System.c
+++ b/Contrib/System/Source/System.c
@@ -1063,7 +1063,7 @@ void ParamsOut(SystemProc *proc)
 #else
             {
                 WCHAR guidstrbuf[39];
-                int guidcch = StringFromGUID2(*((REFGUID*)place), guidstrbuf, g_stringsize);
+                int guidcch = StringFromGUID2(*((REFGUID*)place), guidstrbuf, 39);
                 WideCharToMultiByte(CP_ACP, 0, guidstrbuf, guidcch, realbuf, g_stringsize, NULL, NULL);
             }
 #endif
diff --git a/Docs/src/history.but b/Docs/src/history.but
index d6bf8dcc..7cd6b8ab 100644
--- a/Docs/src/history.but
+++ b/Docs/src/history.but
@@ -12,6 +12,8 @@ Released on ? ?th, 201?
 
 \S2{} Minor Changes
 
+\b Fixed System plugin GUID type output bug on Win98
+
 \b !system and !execute now provide a empty StdIn pipe to work around bugs in some Windows utilities
 
 \b MakeNSISW now uses WinInet when checking for updates