diff --git a/src/IO/tls_openssl.cc b/src/IO/tls_openssl.cc
index 65bfb78..d09028c 100644
--- a/src/IO/tls_openssl.cc
+++ b/src/IO/tls_openssl.cc
@@ -331,14 +331,14 @@ static int Tls_save_certificate_home(X509 * cert)
    int ret = 1;
 
    /* Attempt to create .flenser/certs blindly - check later */
-   snprintf(buf, 4096, "%s/.flenser/", dGethomedir());
+   snprintf(buf, 4096, "%s/.flenser/", dGethomedir_string().value_or("").c_str());
    mkdir(buf, 01777);
-   snprintf(buf, 4096, "%s/.flenser/certs/", dGethomedir());
+   snprintf(buf, 4096, "%s/.flenser/certs/", dGethomedir_string().value_or("").c_str());
    mkdir(buf, 01777);
 
    do {
       snprintf(buf, 4096, "%s/.flenser/certs/%lx.%u",
-               dGethomedir(), X509_subject_name_hash(cert), i);
+               dGethomedir_string().value_or("").c_str(), X509_subject_name_hash(cert), i);
 
       fp=fopen(buf, "r");
       if (fp == NULL){