Index: asm.c
===================================================================
--- asm.c	(revision 27923)
+++ asm.c	(revision 27924)
@@ -160,7 +160,7 @@
 					pcb_subc_get_origin(subc, &x, &y);
 					have_coords = 1;
 				}
-				pcb_sprintf(buf, "%.08mm", x);
+				pcb_append_printf(&s, "%.08mm", x);
 				break;
 			case TT_Y:
 				if (!have_coords) {
@@ -167,7 +167,7 @@
 					pcb_subc_get_origin(subc, &x, &y);
 					have_coords = 1;
 				}
-				pcb_sprintf(buf, "%.08mm", y);
+				pcb_append_printf(&s, "%.08mm", y);
 				break;
 		}
 	}