diff --git a/include/xo/expression/pretty_expression.hpp b/include/xo/expression/pretty_expression.hpp
index a4e07a84..066ce379 100644
--- a/include/xo/expression/pretty_expression.hpp
+++ b/include/xo/expression/pretty_expression.hpp
@@ -26,5 +26,6 @@ namespace xo {
                 return x.pretty_print(ppii);
             }
         };
+
     }
 }
diff --git a/include/xo/expression/pretty_localenv.hpp b/include/xo/expression/pretty_localenv.hpp
index 275ec095..7a09b187 100644
--- a/include/xo/expression/pretty_localenv.hpp
+++ b/include/xo/expression/pretty_localenv.hpp
@@ -8,6 +8,13 @@
 
 namespace xo {
     namespace print {
+        template <>
+        struct ppdetail<xo::scm::Environment> {
+            static bool print_pretty(const ppindentinfo & ppii, const xo::scm::Environment & x) {
+                return x.pretty_print(ppii);
+            }
+        };
+
         template <>
         struct ppdetail<xo::scm::LocalEnv> {
             static bool print_pretty(const ppindentinfo & ppii, const xo::scm::LocalEnv & x) {
diff --git a/include/xo/expression/pretty_variable.hpp b/include/xo/expression/pretty_variable.hpp
index d0440b8e..c53c11a3 100644
--- a/include/xo/expression/pretty_variable.hpp
+++ b/include/xo/expression/pretty_variable.hpp
@@ -12,9 +12,16 @@ namespace xo {
     namespace print {
         template <>
         struct ppdetail<xo::scm::Variable> {
-            static bool print_pretty(const ppindentinfo & ppii, const xo::scm::Expression & x) {
+            static bool print_pretty(const ppindentinfo & ppii, const xo::scm::Variable & x) {
                 return x.pretty_print(ppii);
             }
         };
+
+        template <>
+        struct ppdetail<xo::scm::Variable *> {
+            static bool print_pretty(const ppindentinfo & ppii, const xo::scm::Variable * x) {
+                return x->pretty_print(ppii);
+            }
+        };
     }
 }