diff --git a/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsPositionServiceImpl.tjava b/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsPositionServiceImpl.tjava
index f01b8e5..79d4cbf 100644
--- a/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsPositionServiceImpl.tjava
+++ b/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsPositionServiceImpl.tjava
@@ -9,9 +9,6 @@ import java.io.IOException;
 
 public class AnchorIdlJupiterPerpsPositionServiceImpl implements JupiterPerpsPositionService {
 
-    private final SolanaBlockChain solanaBlockChain;
-    private final AnchorIdlJupiterPerpsPositionDecoder positionDecoder;
-
     public AnchorIdlJupiterPerpsPositionServiceImpl(
             SolanaBlockChain solanaBlockChain
     ) {
@@ -28,7 +25,19 @@ public class AnchorIdlJupiterPerpsPositionServiceImpl implements JupiterPerpsPos
             throw new IllegalArgumentException("Jupiter Perps position account does not exist: " + positionAccount);
         }
 
+        if (!JUPITER_PERPS_PROGRAM_ID.equals(accountInfo.owner())) {
+            throw new IllegalArgumentException(
+                    "Account is not owned by Jupiter Perps program: " + positionAccount
+            );
+        }
+
         JupiterPerpsPosition pos = positionDecoder.decode(positionAccount, accountInfo);
         return pos;
     }
+
+    private static final ΩJupiterPerpsProgramIdΩ JUPITER_PERPS_PROGRAM_ID =
+            "PERPHjGBqRHArX4DySjwM6UJHiR3sWAatqfdBS2qQJu";
+
+    private final SolanaBlockChain solanaBlockChain;
+    private final AnchorIdlJupiterPerpsPositionDecoder positionDecoder;
 }
\ No newline at end of file