diff --git a/crawl-ref/source/ng-restr.cc b/crawl-ref/source/ng-restr.cc
index 3fedac15280..e1105ad6699 100644
--- a/crawl-ref/source/ng-restr.cc
+++ b/crawl-ref/source/ng-restr.cc
@@ -139,7 +139,7 @@ char_choice_restriction weapon_restriction(weapon_type wpn,
     }
 
     if (wpn == WPN_QUARTERSTAFF && ng.job != JOB_GLADIATOR
-        && !(ng.job == JOB_FIGHTER && ng.species == SP_FORMICID || ng.species == SP_ABOMINATION))
+        && !(ng.job == JOB_FIGHTER && (ng.species == SP_FORMICID || ng.species == SP_ABOMINATION)))
     {
         return CC_BANNED;
     }
diff --git a/crawl-ref/source/output.cc b/crawl-ref/source/output.cc
index 2cd47a17245..7716c56ed96 100644
--- a/crawl-ref/source/output.cc
+++ b/crawl-ref/source/output.cc
@@ -2029,7 +2029,7 @@ static void _print_overview_screen_equip(column_composer& cols,
     for (equipment_type eqslot : e_order)
     {
         if ((you.species != SP_OCTOPODE
-            || you.species != SP_ABOMINATION)
+            && you.species != SP_ABOMINATION)
             && eqslot != EQ_WEAPON
             && !you_can_wear(eqslot))
         {
diff --git a/crawl-ref/source/player.cc b/crawl-ref/source/player.cc
index ba2a073eedc..0ce9e03143e 100644
--- a/crawl-ref/source/player.cc
+++ b/crawl-ref/source/player.cc
@@ -707,7 +707,7 @@ maybe_bool you_can_wear(equipment_type eq, bool temp)
             return MB_FALSE;
         // intentional fallthrough
     case EQ_RIGHT_RING:
-        return (you.species != SP_OCTOPODE || you.species != SP_ABOMINATION) ? MB_TRUE : MB_FALSE;
+        return (you.species != SP_OCTOPODE && you.species != SP_ABOMINATION) ? MB_TRUE : MB_FALSE;
 
     case EQ_RING_EIGHT:
         if (you.get_mutation_level(MUT_MISSING_HAND))
@@ -7208,8 +7208,8 @@ bool player::has_usable_pincers(bool allow_tran) const
 
 bool player::has_usable_claws(bool allow_tran) const
 {
-    if (!has_claws(allow_tran))
-        return false;
+    if (has_claws(allow_tran))
+        return true;
 
     if (player_equip_unrand(UNRAND_FISTS_OF_THUNDER))
         return true;