diff --git a/lib/gssapi/krb5/inquire_sec_context_by_oid.c b/lib/gssapi/krb5/inquire_sec_context_by_oid.c
index ec3e5aa67..49d86d11c 100644
--- a/lib/gssapi/krb5/inquire_sec_context_by_oid.c
+++ b/lib/gssapi/krb5/inquire_sec_context_by_oid.c
@@ -430,8 +430,8 @@ get_authtime(OM_uint32 *minor_status,
 
 {
     gss_buffer_desc value;
-    unsigned char buf[4];
-    OM_uint32 authtime;
+    unsigned char buf[SIZEOF_TIME_T];
+    time_t authtime;
 
     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
     if (ctx->ticket == NULL) {
@@ -445,7 +445,13 @@ get_authtime(OM_uint32 *minor_status,
 
     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 
+#if SIZEOF_TIME_T == 8
+    _gss_mg_encode_le_uint64(authtime, buf);
+#elif SIZEOF_TIME_T == 4
     _gss_mg_encode_le_uint32(authtime, buf);
+#else
+#error set SIZEOF_TIME_T for your platform
+#endif
     value.length = sizeof(buf);
     value.value = buf;
 
diff --git a/lib/gssapi/mech/gss_krb5.c b/lib/gssapi/mech/gss_krb5.c
index 8d3e961e5..21bb2bffb 100644
--- a/lib/gssapi/mech/gss_krb5.c
+++ b/lib/gssapi/mech/gss_krb5.c
@@ -538,7 +538,6 @@ gsskrb5_extract_authtime_from_sec_context(OM_uint32 *minor_status,
 {
     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
     OM_uint32 maj_stat;
-    uint32_t tmp;
 
     if (context_handle == GSS_C_NO_CONTEXT) {
 	*minor_status = EINVAL;
@@ -565,14 +564,20 @@ gsskrb5_extract_authtime_from_sec_context(OM_uint32 *minor_status,
 	return GSS_S_FAILURE;
     }
 
-    if (data_set->elements[0].length != 4) {
+    if (data_set->elements[0].length != SIZEOF_TIME_T) {
 	gss_release_buffer_set(minor_status, &data_set);
 	*minor_status = EINVAL;
 	return GSS_S_FAILURE;
     }
 
-    _gss_mg_decode_le_uint32(data_set->elements[0].value, &tmp);
-    *authtime = (time_t)tmp;
+#if SIZEOF_TIME_T == 8
+    _gss_mg_decode_le_uint64(data_set->elements[0].value, (uint64_t *)authtime);
+#elif SIZEOF_TIME_T == 4
+    _gss_mg_decode_le_uint32(data_set->elements[0].value, (uint32_t *)authtime);
+#else
+#error set SIZEOF_TIME_T for your platform
+#endif
+
     gss_release_buffer_set(minor_status, &data_set);
 
     *minor_status = 0;