Bug: https://bugs.gentoo.org/610692

--- a/src/targets.cpp
+++ b/src/targets.cpp
@@ -113,12 +113,12 @@
 
   double ll = LOG_1;
   double tot_mass = mass(with_pseudo);
-  double tot_eff_len = cached_effective_length(lib.bias_table);
+  double tot_eff_len = cached_effective_length(static_cast<bool>(lib.bias_table));
   if (neighbors) {
     foreach (const Target* neighbor, *neighbors) {
       tot_mass = log_add(tot_mass, neighbor->mass(with_pseudo));
       tot_eff_len = log_add(tot_eff_len,
-                            neighbor->cached_effective_length(lib.bias_table));
+                            neighbor->cached_effective_length(static_cast<bool>(lib.bias_table)));
     }
   }
   ll += tot_mass - tot_eff_len;