diff --git a/.changeset/sour-mugs-press.md b/.changeset/sour-mugs-press.md
new file mode 100644
index 000000000000..89a2e654ae1b
--- /dev/null
+++ b/.changeset/sour-mugs-press.md
@@ -0,0 +1,5 @@
+---
+'@solana/errors': patch
+---
+
+The `innerInstructions` property of JSON-RPC errors used snake case rather than camelCase for `stackHeight` and `programId`. This has been corrected.
diff --git a/packages/errors/src/json-rpc-error.ts b/packages/errors/src/json-rpc-error.ts
index 2f98c694b7f4..b942aa0db253 100644
--- a/packages/errors/src/json-rpc-error.ts
+++ b/packages/errors/src/json-rpc-error.ts
@@ -61,21 +61,21 @@ export interface RpcSimulateTransactionResult {
                         accounts: number[];
                         data: string;
                         programIdIndex: number;
-                        stack_height?: number;
+                        stackHeight?: number;
                     }
                   | {
                         // Parsed
                         parsed: unknown;
                         program: string;
-                        program_id: string;
-                        stack_height?: number;
+                        programId: string;
+                        stackHeight?: number;
                     }
                   | {
                         // PartiallyDecoded
                         accounts: string[];
                         data: string;
-                        program_id: string;
-                        stack_height?: number;
+                        programId: string;
+                        stackHeight?: number;
                     }
               )[];
           }[]