diff --git a/model/VolumeBase.h b/model/VolumeBase.h
index 92a83f0..28802d4 100644
--- a/model/VolumeBase.h
+++ b/model/VolumeBase.h
@@ -76,15 +76,15 @@
         kBadRemoval,
     };
 
-    const std::string& getId() { return mId; }
-    const std::string& getDiskId() { return mDiskId; }
-    const std::string& getPartGuid() { return mPartGuid; }
-    Type getType() { return mType; }
-    int getMountFlags() { return mMountFlags; }
-    userid_t getMountUserId() { return mMountUserId; }
-    State getState() { return mState; }
-    const std::string& getPath() { return mPath; }
-    const std::string& getInternalPath() { return mInternalPath; }
+    const std::string& getId() const { return mId; }
+    const std::string& getDiskId() const { return mDiskId; }
+    const std::string& getPartGuid() const { return mPartGuid; }
+    Type getType() const { return mType; }
+    int getMountFlags() const { return mMountFlags; }
+    userid_t getMountUserId() const { return mMountUserId; }
+    State getState() const { return mState; }
+    const std::string& getPath() const { return mPath; }
+    const std::string& getInternalPath() const { return mInternalPath; }
 
     status_t setDiskId(const std::string& diskId);
     status_t setPartGuid(const std::string& partGuid);
@@ -116,7 +116,7 @@
     status_t setPath(const std::string& path);
     status_t setInternalPath(const std::string& internalPath);
 
-    android::sp<android::os::IVoldListener> getListener();
+    android::sp<android::os::IVoldListener> getListener() const;
 
   private:
     /* ID that uniquely references volume while alive */