diff --git a/Plugins/PluginPerfMon/Titledb.cpp b/Plugins/PluginPerfMon/Titledb.cpp
index 49ab5f81..16f4f097 100644
--- a/Plugins/PluginPerfMon/Titledb.cpp
+++ b/Plugins/PluginPerfMon/Titledb.cpp
@@ -39,7 +39,7 @@ CPerfTitleDatabase::CPerfTitleDatabase(
 
 	// Find out the max number of entries
 	HKEY hKeyPerflib = 0;
-	DWORD cbLastIndex;
+	DWORD cbLastIndex = sizeof(DWORD);
 
 	// Open the registry key that has the values for the maximum number
 	// of title strings