diff --git a/codes/Basic/SVGWriter.cpp b/codes/Basic/SVGWriter.cpp
index 22f12376..9fb6ccf4 100644
--- a/codes/Basic/SVGWriter.cpp
+++ b/codes/Basic/SVGWriter.cpp
@@ -1,4 +1,4 @@
-#ifdef CKISEKI
+#ifndef CKISEKI
 #define ostream stringstream
 #endif
 class SVG {