diff --git a/plugins/autohauler.cpp b/plugins/autohauler.cpp
index e222a9702..c43ec110e 100644
--- a/plugins/autohauler.cpp
+++ b/plugins/autohauler.cpp
@@ -624,7 +624,7 @@ static void init_state()
         df::unit_labor labor = (df::unit_labor) atoi(key.substr(strlen("autohauler/labors/")).c_str());
 
         // Ensure that the labor is defined in the existing list
-        if (labor >= 0 && size_t(labor) <= labor_infos.size())
+        if (labor >= 0 && size_t(labor) < labor_infos.size())
         {
             // Link the labor treatment with the associated persistent data item
             labor_infos[labor].set_config(*p);
diff --git a/plugins/autolabor.cpp b/plugins/autolabor.cpp
index 6ca0a2658..936ce4022 100644
--- a/plugins/autolabor.cpp
+++ b/plugins/autolabor.cpp
@@ -606,7 +606,7 @@ static void init_state()
     {
         string key = p->key();
         df::unit_labor labor = (df::unit_labor) atoi(key.substr(strlen("autolabor/labors/")).c_str());
-        if (labor >= 0 && size_t(labor) <= labor_infos.size())
+        if (labor >= 0 && size_t(labor) < labor_infos.size())
         {
             labor_infos[labor].config = *p;
             labor_infos[labor].is_exclusive = default_labor_infos[labor].is_exclusive;
diff --git a/plugins/labormanager/labormanager.cpp b/plugins/labormanager/labormanager.cpp
index cf183f452..7c749edce 100644
--- a/plugins/labormanager/labormanager.cpp
+++ b/plugins/labormanager/labormanager.cpp
@@ -614,7 +614,7 @@ static void init_state()
     {
         string key = p->key();
         df::unit_labor labor = (df::unit_labor) atoi(key.substr(strlen("labormanager/2.0/labors/")).c_str());
-        if (labor >= 0 && size_t(labor) <= labor_infos.size())
+        if (labor >= 0 && size_t(labor) < labor_infos.size())
         {
             labor_infos[labor].config = *p;
             labor_infos[labor].active_dwarfs = 0;