diff --git a/others/planck.c b/others/planck.c
index 1d58a12..d0760a2 100644
--- a/others/planck.c
+++ b/others/planck.c
@@ -207,6 +207,9 @@ defcode("(allocate)", allocate) {
     push((cell) p);
     next();
 }
-defcode("(free)", free_) { free((void*) pop()); }
+defcode("(free)", free_) {
+    free((void*) pop());
+    next();
+}
 
 #endif