diff --git a/spf.py b/spf.py
index c8bd74d..82cfd15 100755
--- a/spf.py
+++ b/spf.py
@@ -15,10 +15,8 @@ class SPFInterpreter(lark.visitors.Interpreter):
         self.variables = Variables(trace)
 
     def while_loop(self, el):
-        print("TODO: while")
-        cond = el.children[0]
-        instr = el.children[1:]
-        print(cond.pretty())
+        while self.visit_children(el.children[0])[0]:
+            [self.visit_children(i) for i in el.children[1:]]
 
     def for_loop(self, el):
         print("TODO: for")