diff --git a/src/openvic-simulation/core/error/Error.hpp b/src/openvic-simulation/core/error/Error.hpp
index f96b92f71..d28ca1ad6 100644
--- a/src/openvic-simulation/core/error/Error.hpp
+++ b/src/openvic-simulation/core/error/Error.hpp
@@ -3,6 +3,8 @@
 #include <cstdint>
 #include <string_view>
 
+#include "openvic-simulation/core/Typedefs.hpp"
+
 namespace OpenVic {
 	enum class Error : uint8_t {
 		OK, // Being 0 means failure can be checked with "if (Error)"
@@ -61,5 +63,7 @@ namespace OpenVic {
 		case BUG:				  return "Bug";
 		case MAX:				  return "";
 		}
+
+		OpenVic::unreachable();
 	}
 }
diff --git a/src/openvic-simulation/country/CountryInstance.cpp b/src/openvic-simulation/country/CountryInstance.cpp
index 20600dd7f..8c1960605 100644
--- a/src/openvic-simulation/country/CountryInstance.cpp
+++ b/src/openvic-simulation/country/CountryInstance.cpp
@@ -381,6 +381,8 @@ bool CountryInstance::may_build_in(const BuildingRestrictionCategory restriction
 		case BuildingRestrictionCategory::FACTORY:
 			return rule_set.may_invest_in_building_factory_abroad();
 	}
+
+	OpenVic::unreachable();
 }
 
 CountryRelationManager::relation_value_type CountryInstance::get_relations_with(CountryInstance const& country) const {
diff --git a/src/openvic-simulation/misc/GameRulesManager.cpp b/src/openvic-simulation/misc/GameRulesManager.cpp
index acd021084..8b7dac0ce 100644
--- a/src/openvic-simulation/misc/GameRulesManager.cpp
+++ b/src/openvic-simulation/misc/GameRulesManager.cpp
@@ -1,5 +1,6 @@
 #include "GameRulesManager.hpp"
 
+#include "openvic-simulation/core/Typedefs.hpp"
 #include "openvic-simulation/country/CountryInstance.hpp"
 #include "openvic-simulation/map/ProvinceDefinition.hpp"
 #include "openvic-simulation/map/ProvinceInstance.hpp"
@@ -24,6 +25,8 @@ bool GameRulesManager::may_use_coastal_artisanal_production_types(ProvinceInstan
 		case CoastalProvinces:
 			return is_coastal_province;
 	}
+
+	OpenVic::unreachable();
 }
 
 bool GameRulesManager::may_use_coastal_factory_production_types(State const& state) const {
@@ -40,4 +43,6 @@ bool GameRulesManager::may_use_coastal_factory_production_types(State const& sta
 			return is_coastal_state;
 		}
 	}
-}
\ No newline at end of file
+
+	OpenVic::unreachable();
+}