diff --git a/cameo/shape.c b/cameo/shape.c
index f473f01..f360c1c 100644
--- a/cameo/shape.c
+++ b/cameo/shape.c
@@ -17,17 +17,14 @@
 #include "shape.h"
 
 
-static struct path *path;
-
-
 static double arc2angle(double arc, double r)
 {
 	return acos(1-arc*arc/(r*r)/2);
 }
 
 
-static void half_circle(double cx, double cy, double rx, double ry, double z,
-    double s)
+static void half_circle(struct path *path,
+    double cx, double cy, double rx, double ry, double z, double s)
 {
 	double m[4];
 	double x = rx, y = ry, tmp;
@@ -51,6 +48,7 @@ static void half_circle(double cx, double cy, double rx, double ry, double z,
 struct path *slot(double xa, double ya, double xb, double yb, double z,
     double sr, double tr, double step, const char *id)
 {
+	struct path *path;
 	double dx = xb-xa;
 	double dy = yb-ya;
 	double s = arc2angle(step, sr);
@@ -66,8 +64,8 @@ struct path *slot(double xa, double ya, double xb, double yb, double z,
 		nx = -dy*f;
 		ny = dx*f;
 
-		half_circle(xa, ya, nx, ny, z, s);
-		half_circle(xb, yb, -nx, -ny, z, s);
+		half_circle(path, xa, ya, nx, ny, z, s);
+		half_circle(path, xb, yb, -nx, -ny, z, s);
 		path_add(path, xa+nx, ya+ny, z);
 	}
 	return path;
@@ -77,6 +75,7 @@ struct path *slot(double xa, double ya, double xb, double yb, double z,
 struct path *circle(double cx, double cy, double cz, double cr, double tr,
     double step, const char *id)
 {
+	struct path *path;
 	double s = arc2angle(step, cr);
 	double a;