diff --git a/lib/checkbufferoverrun.h b/lib/checkbufferoverrun.h
index 494dcf7c6..4d431d31c 100644
--- a/lib/checkbufferoverrun.h
+++ b/lib/checkbufferoverrun.h
@@ -36,7 +36,7 @@
 #include <vector>
 
 namespace tinyxml2 {
-	class XMLElement;
+    class XMLElement;
 }
 
 class ErrorLogger;