diff --git a/src/security/sec-tpm-osx.cpp b/src/security/sec-tpm-osx.cpp
index a7e1cd9..69c3deb 100644
--- a/src/security/sec-tpm-osx.cpp
+++ b/src/security/sec-tpm-osx.cpp
@@ -269,7 +269,7 @@
 }
 
 bool
-SecTpmOsx::getInTerminal()
+SecTpmOsx::getInTerminal() const
 {
   return m_impl->m_inTerminal;
 }