diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -753,8 +753,8 @@
             "key\n"
             "         \"redeemScript\": \"hex\",   (string, required for P2SH "
             "or P2WSH) redeem script\n"
-            "         \"amount\": value            (numeric, required) The "
-            "amount spent\n"
+            "         \"amount\": \"value\"        (string, required) The "
+            "decimal amount spent\n"
             "       }\n"
             "       ,...\n"
             "    ]\n"
@@ -906,6 +906,7 @@
                                 {"txid", UniValueType(UniValue::VSTR)},
                                 {"vout", UniValueType(UniValue::VNUM)},
                                 {"scriptPubKey", UniValueType(UniValue::VSTR)},
+                                {"amount", UniValueType(UniValue::VSTR)},
                             });
 
             uint256 txid = ParseHashO(prevOut, "txid");
@@ -940,6 +941,13 @@
                     coins->vout[nOut].nValue =
                         AmountFromValue(find_value(prevOut, "amount"));
                 }
+                if (coins->vout[nOut].nValue <= 0LL) {
+                    // 'amount' param is now required to be >0 in signed tx
+                    throw JSONRPCError(RPC_INVALID_PARAMETER,
+                                       strprintf("Amount on previous output "
+                                                 "%d must be >0",
+                                                 nOut));
+                }
             }
 
             // If redeemScript given and not using the local wallet (private
@@ -952,6 +960,7 @@
                                  {"vout", UniValueType(UniValue::VNUM)},
                                  {"scriptPubKey", UniValueType(UniValue::VSTR)},
                                  {"redeemScript", UniValueType(UniValue::VSTR)},
+                                 {"amount", UniValueType(UniValue::VSTR)},
                              });
                 UniValue v = find_value(prevOut, "redeemScript");
                 if (!v.isNull()) {
diff --git a/src/test/rpc_tests.cpp b/src/test/rpc_tests.cpp
--- a/src/test/rpc_tests.cpp
+++ b/src/test/rpc_tests.cpp
@@ -135,6 +135,7 @@
                           "8f50977c8493f3\","
                           "\"vout\":1,\"scriptPubKey\":"
                           "\"a914b10c9df5f7edf436c697f02f1efdba4cf399615187\","
+                          "\"amount\":\"3.14159\","
                           "\"redeemScript\":"
                           "\"512103debedc17b3df2badbcdd86d5feb4562b86fe182e5998"
                           "abd8bcd4f122c6155b1b21027e940bb73ab8732bfdf7f9216ece"
@@ -154,6 +155,45 @@
     BOOST_CHECK(find_value(r.get_obj(), "complete").get_bool() == true);
 }
 
+BOOST_AUTO_TEST_CASE(rpc_rawsign_missing_amount) {
+    // Old format, missing amount parameter for prevout should generate
+    // an RPC error.  This is because of new replay-protected tx's require
+    // nonzero amount present in signed tx.
+    // See: https://github.com/Bitcoin-ABC/bitcoin-abc/issues/63
+    // (We will re-use the tx + keys from the above rpc_rawsign test for
+    // simplicity.)
+    UniValue r;
+    std::string prevout = "[{\"txid\":"
+                          "\"b4cc287e58f87cdae59417329f710f3ecd75a4ee1d2872b724"
+                          "8f50977c8493f3\","
+                          "\"vout\":1,\"scriptPubKey\":"
+                          "\"a914b10c9df5f7edf436c697f02f1efdba4cf399615187\","
+                          "\"redeemScript\":"
+                          "\"512103debedc17b3df2badbcdd86d5feb4562b86fe182e5998"
+                          "abd8bcd4f122c6155b1b21027e940bb73ab8732bfdf7f9216ece"
+                          "fca5b94d6df834e77e108f68e66f126044c052ae\"}]";
+    r = CallRPC(std::string("createrawtransaction ") + prevout + " " +
+                "{\"3HqAe9LtNBjnsfM4CyYaWTnvCaUYT7v4oZ\":11}");
+    std::string notsigned = r.get_str();
+    std::string privkey1 =
+        "\"KzsXybp9jX64P5ekX1KUxRQ79Jht9uzW7LorgwE65i5rWACL6LQe\"";
+    std::string privkey2 =
+        "\"Kyhdf5LuKTRx4ge69ybABsiUAWjVRK4XGxAKk2FQLp2HjGMy87Z4\"";
+    bool exceptionThrownDueToMissingAmount = false,
+         errorWasMissingAmount = false;
+    try {
+        r = CallRPC(std::string("signrawtransaction ") + notsigned + " " +
+                    prevout + " " + "[" + privkey1 + "," + privkey2 + "]");
+    } catch (const std::runtime_error &e) {
+        exceptionThrownDueToMissingAmount = true;
+        if (std::string(e.what()).find("amount") != std::string::npos) {
+            errorWasMissingAmount = true;
+        }
+    }
+    BOOST_CHECK(exceptionThrownDueToMissingAmount == true);
+    BOOST_CHECK(errorWasMissingAmount == true);
+}
+
 BOOST_AUTO_TEST_CASE(rpc_createraw_op_return) {
     BOOST_CHECK_NO_THROW(
         CallRPC("createrawtransaction "