diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index e7c8e2bdd..c7d4f8a16 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -5733,6 +5733,24 @@ UniValue oraclescreate(const UniValue& params, bool fHelp)
         ERR_RESULT("oracles format must be <= 4096 characters");
         return(result);
     }
+    // list of oracle valid formats from oracles.cpp -> oracle_format
+    const UniValue valid_formats[13] = {"s","S","d","D","c","C","t","T","i","I","l","L","h"};
+    const UniValue header_type = "Ihh";
+    // checking if oracle data type is valid
+    bool is_valid_format = false;
+    for ( int i = 0; i < 13; ++i ) {
+        if ( valid_formats[i].get_str() == format ) {
+            is_valid_format = true;
+        }
+    }
+    // additional check for special Ihh data type
+    if ( format == header_type.get_str() ) {
+        is_valid_format = true;
+    }
+    if ( !is_valid_format ) {
+        ERR_RESULT("oracles format not valid");
+        return(result);
+    }
     hex = OracleCreate(0,name,description,format);
     if ( hex.size() > 0 )
     {