diff --git a/src/security/sec-tpm-memory.hpp b/src/security/sec-tpm-memory.hpp
index df0c7e3..e0dd34c 100644
--- a/src/security/sec-tpm-memory.hpp
+++ b/src/security/sec-tpm-memory.hpp
@@ -64,7 +64,7 @@
   }
 
   virtual bool
-  getInTerminal()
+  getInTerminal() const
   {
     return m_inTerminal;
   }