diff --git a/lib/exec.js b/lib/exec.js
index 021012c..a7c35ad 100644
--- a/lib/exec.js
+++ b/lib/exec.js
@@ -81,6 +81,10 @@ function exec(cb) {
       code = Node.createNode(Node.CODE_BLOCK);
 
       code.literal = '' + res;
+      code._isFenced = true;
+      code._fenceChar = '`'
+      code._fenceLength = 3;
+
       if(info) {
         code.info = info;
       }
diff --git a/lib/macro.js b/lib/macro.js
index 40a9c0e..fd42354 100644
--- a/lib/macro.js
+++ b/lib/macro.js
@@ -74,6 +74,9 @@ function macro(cb) {
       }
       code = Node.createNode(Node.CODE_BLOCK);
       code.literal = result;
+      code._isFenced = true;
+      code._fenceChar = '`'
+      code._fenceLength = 3;
       if(info) {
         code.info = info;
       }
diff --git a/lib/source.js b/lib/source.js
index 087b392..b8f31d3 100644
--- a/lib/source.js
+++ b/lib/source.js
@@ -58,6 +58,9 @@ function source(cb) {
       var code = Node.createNode(Node.CODE_BLOCK);
 
       code.literal = result;
+      code._isFenced = true;
+      code._fenceChar = '`'
+      code._fenceLength = 3;
       if(info) {
         code.info = info;
       }