diff --git a/src/cc/import.cpp b/src/cc/import.cpp
index 26f878369..33e6a5b60 100644
--- a/src/cc/import.cpp
+++ b/src/cc/import.cpp
@@ -54,6 +54,9 @@ bool Eval::ImportCoin(const std::vector<uint8_t> params, const CTransaction &imp
     if (targetCcid != GetAssetchainsCC() || targetSymbol != GetAssetchainsSymbol())
         return Invalid("importcoin-wrong-chain");
 
+    if (targetCcid <= 1000)
+        return Invalid("chain-not-fungible");
+
     // check burn amount
     {
         uint64_t burnAmount = burnTx.vout[0].nValue;
diff --git a/src/crosschain.cpp b/src/crosschain.cpp
index ca7223abb..197390e59 100644
--- a/src/crosschain.cpp
+++ b/src/crosschain.cpp
@@ -42,7 +42,7 @@ uint256 CalculateProofRoot(const char* symbol, uint32_t targetCCid, int kmdHeigh
      *        > scan backwards >
      */
 
-    if (targetCCid <= 1)
+    if (targetCCid < 2)
         return uint256();
 
     if (kmdHeight < 0 || kmdHeight > chainActive.Height())
diff --git a/src/rpccrosschain.cpp b/src/rpccrosschain.cpp
index 35542613a..44f55b44a 100644
--- a/src/rpccrosschain.cpp
+++ b/src/rpccrosschain.cpp
@@ -153,8 +153,8 @@ UniValue migrate_converttoexport(const UniValue& params, bool fHelp)
             "import transaction.\n"
             );
 
-    if (ASSETCHAINS_CC < 2)
-        throw runtime_error("-ac_cc < 2");
+    if (ASSETCHAINS_CC <= 1000)
+        throw runtime_error("-ac_cc <= 1000");
 
     if (ASSETCHAINS_SYMBOL[0] == 0)
         throw runtime_error("Must be called on assetchain");
@@ -208,8 +208,8 @@ UniValue migrate_createimporttransaction(const UniValue& params, bool fHelp)
         throw runtime_error("migrate_createimporttransaction burnTx payouts\n\n"
                 "Create an importTx given a burnTx and the corresponding payouts, hex encoded");
 
-    if (ASSETCHAINS_CC < 2)
-        throw runtime_error("-ac_cc < 2");
+    if (ASSETCHAINS_CC <= 1000)
+        throw runtime_error("-ac_cc <= 1000");
 
     if (ASSETCHAINS_SYMBOL[0] == 0)
         throw runtime_error("Must be called on assetchain");