diff --git a/ChangeLog b/ChangeLog
index 5d54d2049..91f3e5671 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2011-05-03  Holger Vogt
+ * x11.c, graph.h: move #define NUMCOLORS to x11.c to avoid redefinition 
+   under MS Visual Studion
+
 2011-05-01  Robert Larice
  * src/frontend/outitf.c ,
  * src/spicelib/analysis/cktpzstr.c ,
diff --git a/src/frontend/plotting/x11.c b/src/frontend/plotting/x11.c
index 7e083f2a7..00937acee 100644
--- a/src/frontend/plotting/x11.c
+++ b/src/frontend/plotting/x11.c
@@ -57,6 +57,8 @@ $Id$
 #define NXPLANES 5      /* note: What is this used for? */
 #define BOXSIZE 30      /* initial size of bounding box for zoomin */
 
+#define NUMCOLORS 20
+
 typedef struct x11info {
     Window window;
     int	isopen;
diff --git a/src/include/graph.h b/src/include/graph.h
index 311eb3449..249675936 100644
--- a/src/include/graph.h
+++ b/src/include/graph.h
@@ -20,8 +20,6 @@ struct _keyed;
 
 /* Device-independent data structure for plots. */
 
-#define NUMCOLORS 20
-
 struct graph {
     int graphid;
     struct dveclist *plotdata;  /* normalized data */