diff --git a/src/xrpld/app/wasm/detail/HostFuncImplGetter.cpp b/src/xrpld/app/wasm/detail/HostFuncImplGetter.cpp
index 10f0d4a03e..6b956de8a0 100644
--- a/src/xrpld/app/wasm/detail/HostFuncImplGetter.cpp
+++ b/src/xrpld/app/wasm/detail/HostFuncImplGetter.cpp
@@ -118,15 +118,18 @@ locateField(STObject const& obj, Slice const& locator)
     if (locator.empty() || (locator.size() & 3))  // must be multiple of 4
         return Unexpected(HostFunctionError::LOCATOR_MALFORMED);
 
+    static_assert(maxWasmParamLength % sizeof(int32_t) == 0);
     int32_t locBuf[maxWasmParamLength / sizeof(int32_t)];
     int32_t const* locPtr = &locBuf[0];
     int32_t const locSize = locator.size() / sizeof(int32_t);
 
-    uintptr_t p = reinterpret_cast<uintptr_t>(locator.data());
-    if (p & (alignof(int32_t) - 1))  // unaligned
-        memcpy(&locBuf[0], locator.data(), locator.size());
-    else
-        locPtr = reinterpret_cast<int32_t const*>(locator.data());
+    {
+        uintptr_t const p = reinterpret_cast<uintptr_t>(locator.data());
+        if (p & (alignof(int32_t) - 1))  // unaligned
+            memcpy(&locBuf[0], locator.data(), locator.size());
+        else
+            locPtr = reinterpret_cast<int32_t const*>(locator.data());
+    }
 
     STBase const* field = nullptr;
     auto const& knownSFields = SField::getKnownCodeToField();