diff --git a/src/security/sec-tpm.cpp b/src/security/sec-tpm.cpp
index d8c6a4f..a4b27f1 100644
--- a/src/security/sec-tpm.cpp
+++ b/src/security/sec-tpm.cpp
@@ -43,7 +43,7 @@
 std::string
 SecTpm::getTpmLocator()
 {
-  return this->getScheme() + m_location;
+  return this->getScheme() + ":" + m_location;
 }
 
 ConstBufferPtr