diff --git a/graphics/grTCairo1.c b/graphics/grTCairo1.c
index 29fc05eb..30cb777a 100644
--- a/graphics/grTCairo1.c
+++ b/graphics/grTCairo1.c
@@ -1079,7 +1079,7 @@ char *name;
 	static int WindowNumber = 0;
 	HashEntry	*entry;
 	char	*windowplace;
-	char	windowname[10];
+	char	windowname[32];
 	int		x      = w->w_frameArea.r_xbot;
 	int		y      = grTransYs(w->w_frameArea.r_ytop);
 	int		width  = w->w_frameArea.r_xtop - w->w_frameArea.r_xbot;
diff --git a/graphics/grTOGL1.c b/graphics/grTOGL1.c
index 2feccdf1..6b1522ee 100644
--- a/graphics/grTOGL1.c
+++ b/graphics/grTOGL1.c
@@ -1081,7 +1081,7 @@ GrTOGLCreate(w, name)
     static int WindowNumber = 0;
     HashEntry	*entry;
     char	*windowplace;
-    char	windowname[10];
+    char	windowname[32];
     int		x      = w->w_frameArea.r_xbot;
     int		y      = glTransYs(w->w_frameArea.r_ytop);
     int		width  = w->w_frameArea.r_xtop - w->w_frameArea.r_xbot;
diff --git a/graphics/grTk1.c b/graphics/grTk1.c
index 7712d333..3f080055 100644
--- a/graphics/grTk1.c
+++ b/graphics/grTk1.c
@@ -1308,7 +1308,7 @@ GrTkCreate(w, name)
     static int WindowNumber = 0;
     HashEntry	*entry;
     char	*windowplace;
-    char	windowname[10];
+    char	windowname[32];
     int		x      = w->w_frameArea.r_xbot;
     int		y      = grMagicToXs(w->w_frameArea.r_ytop);
     int		width  = w->w_frameArea.r_xtop - w->w_frameArea.r_xbot;