diff --git a/nudt.json b/nudt.json
index 6e0f04e..dd9f09f 100644
--- a/nudt.json
+++ b/nudt.json
@@ -23,7 +23,7 @@
         },
         {
             "type": "sampler",
-            "ports": [2, 3],
+            "ports": [2, 3]
         },
         {
             "type": "zotino",
diff --git a/sysu.json b/sysu.json
index 9dcbf66..e49f078 100644
--- a/sysu.json
+++ b/sysu.json
@@ -38,6 +38,6 @@
             "type": "urukul",
             "ports": [1, 0],
             "clk_sel": 0
-        },
+        }
     ]
 }
diff --git a/tsinghua.json b/tsinghua.json
index 7356ab2..5136848 100644
--- a/tsinghua.json
+++ b/tsinghua.json
@@ -22,7 +22,7 @@
         {
             "type": "zotino",
             "ports": [7]
-        }
+        },
         {
             "type": "grabber",
             "ports": [1, 0]