diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index 4c5acf2bd7e65..c5c15ad665592 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -169,6 +169,15 @@ int ParseInt(const UniValue& o, std::string strKey)
     return v.get_int();
 }
 
+double ParseDoubleV(const UniValue& v, const std::string &strName)
+{
+    std::string strNum = v.getValStr();
+    double num;
+    if (!ParseDouble(strNum, &num))
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be a be number (not '"+strNum+"')");
+    return num;
+}
+
 bool ParseBool(const UniValue& o, std::string strKey)
 {
     const UniValue& v = find_value(o, strKey);
diff --git a/src/rpc/server.h b/src/rpc/server.h
index c026f9df45b18..32637bfa9a9b8 100644
--- a/src/rpc/server.h
+++ b/src/rpc/server.h
@@ -189,6 +189,7 @@ extern std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strNa
 extern std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey);
 extern int ParseInt(const UniValue& o, std::string strKey);
 extern bool ParseBool(const UniValue& o, std::string strKey);
+extern double ParseDoubleV(const UniValue& v, const std::string &strName);
 
 extern CAmount AmountFromValue(const UniValue& value);
 extern UniValue ValueFromAmount(const CAmount& amount);