Fix warning

diff --git a/plugin/gd/gvrender_gd_vrml.c b/plugin/gd/gvrender_gd_vrml.c
index a44c5731155c14c1a38e2f7bf2e6e7b35edca906..a6f0571a127875a352aaaab7b0f99b48eb955b0c 100644 (file)
--- a/plugin/gd/gvrender_gd_vrml.c
+++ b/plugin/gd/gvrender_gd_vrml.c
@@ -113,7 +113,7 @@ static char *nodefilename(const char *filename, node_t * n, char *buf)
 #ifndef WITH_CGRAPH
     sprintf(buf, "%s/node%d.png", dir, AGSEQ(n));
 #else
-    sprintf(buf, "%s/node%ld.png", dir, AGSEQ(n));
+    sprintf(buf, "%s/node%ld.png", dir, (unsigned long)AGSEQ(n));
 #endif
     return buf;
 }