diff --git a/src/defs.h b/src/defs.h
index 62d20209..e4392a35 100644
--- a/src/defs.h
+++ b/src/defs.h
@@ -226,7 +226,8 @@ struct session_data {
    float __acquire, __parsed, __av, __store, __compress, __encrypt;
    char bodydigest[2*DIGEST_LENGTH+1];
    char digest[2*DIGEST_LENGTH+1];
-   time_t now, sent, delivered, retained;
+   time_t now, sent, delivered;
+   unsigned long retained;
    char ms_journal;
    char import;
    int journal_envelope_length, journal_bottom_length;
diff --git a/src/test.c b/src/test.c
index e9774f25..67a2d5af 100644
--- a/src/test.c
+++ b/src/test.c
@@ -112,7 +112,7 @@ int main(int argc, char **argv){
 
    printf("folder: %d\n", get_folder_id_by_rule(&data, &state, st.st_size, sdata.spam_message, &cfg));
 
-   printf("retention period: %ld\n", sdata.retained);
+   printf("retention period: %lu\n", sdata.retained);
 
    clearrules(data.archiving_rules);
    clearrules(data.retention_rules);