diff --git a/res/res_fax.c b/res/res_fax.c
index 247251c8b2..aef6360ff0 100644
--- a/res/res_fax.c
+++ b/res/res_fax.c
@@ -1281,6 +1281,10 @@ static struct ast_fax_session *fax_session_new(struct ast_fax_session_details *d
 			}
 			ast_debug(4, "Requesting a new FAX session from '%s'.\n", faxmod->tech->description);
 			ast_module_ref(faxmod->tech->module);
+			if (reserved) {
+				/* Balance module ref from reserved session */
+				ast_module_unref(reserved->tech->module);
+			}
 			s->tech = faxmod->tech;
 			break;
 		}