diff --git a/engines/sci/engine/object.cpp b/engines/sci/engine/object.cpp
index aee93ffaa754..f09f18298ac3 100644
--- a/engines/sci/engine/object.cpp
+++ b/engines/sci/engine/object.cpp
@@ -58,14 +58,14 @@ void Object::init(byte *buf, reg_t obj_pos, bool initVariables) {
 
 	if (getSciVersion() <= SCI_VERSION_1_LATE) {
 		_variables.resize(READ_LE_UINT16(data + kOffsetSelectorCounter));
-		_baseVars = (uint16 *)(_baseObj + _variables.size() * 2);
+		_baseVars = (const uint16 *)(_baseObj + _variables.size() * 2);
 		_methodCount = READ_LE_UINT16(data + READ_LE_UINT16(data + kOffsetFunctionArea) - 2);
 		for (int i = 0; i < _methodCount * 2 + 2; ++i) {
 			_baseMethod.push_back(READ_SCI11ENDIAN_UINT16(data + READ_LE_UINT16(data + kOffsetFunctionArea) + i * 2));
 		}
 	} else if (getSciVersion() >= SCI_VERSION_1_1 && getSciVersion() <= SCI_VERSION_2_1) {
 		_variables.resize(READ_SCI11ENDIAN_UINT16(data + 2));
-		_baseVars = (uint16 *)(buf + READ_SCI11ENDIAN_UINT16(data + 4));
+		_baseVars = (const uint16 *)(buf + READ_SCI11ENDIAN_UINT16(data + 4));
 		_methodCount = READ_SCI11ENDIAN_UINT16(buf + READ_SCI11ENDIAN_UINT16(data + 6));
 		for (int i = 0; i < _methodCount * 2 + 3; ++i) {
 			_baseMethod.push_back(READ_SCI11ENDIAN_UINT16(buf + READ_SCI11ENDIAN_UINT16(data + 6) + i * 2));
diff --git a/engines/sci/engine/object.h b/engines/sci/engine/object.h
index 7e07fb2f6da1..80c8e9e83db3 100644
--- a/engines/sci/engine/object.h
+++ b/engines/sci/engine/object.h
@@ -236,7 +236,7 @@ class Object {
 	void initSelectorsSci3(const byte *buf);
 
 	const byte *_baseObj; /**< base + object offset within base */
-	uint16 *_baseVars; /**< Pointer to the varselector area for this object */
+	const uint16 *_baseVars; /**< Pointer to the varselector area for this object */
 	Common::Array<uint16> _baseMethod; /**< Pointer to the method selector area for this object */
 	uint16 *_propertyOffsetsSci3; /**< This is used to enable relocation of property valuesa in SCI3 */