diff --git a/gte/rpnlib.py b/gte/rpnlib.py
index 9c1c27f..a9fd0d3 100644
--- a/gte/rpnlib.py
+++ b/gte/rpnlib.py
@@ -60,6 +60,9 @@ class RpnExpr(list):
             raise TypeError('RpnSymbol expected but got %s' % type(val))
         super().__setitem(idx, val)
 
+    def __str__(self):
+        return ' '.join([str(sym) for sym in self])
+
     @classmethod
     def random(cls, sz):
         return cls([RpnSymbol.random() for _ in range(sz)])