diff --git a/bin/ai/regression/regression.txt b/bin/ai/regression/regression.txt
index 2a60fd8de4..4b70aa11e0 100644
--- a/bin/ai/regression/regression.txt
+++ b/bin/ai/regression/regression.txt
@@ -6934,7 +6934,7 @@
     Id:                      9
     IsRawIndustry():         true
     ProductionCanIncrease(): true
-    GetConstructionCost():   747070
+    GetConstructionCost():   -1
     GetName():               Farm
     CanBuildIndustry():      false
     CanProspectIndustry():   false
@@ -6944,7 +6944,7 @@
     Id:                      5
     IsRawIndustry():         true
     ProductionCanIncrease(): true
-    GetConstructionCost():   747070
+    GetConstructionCost():   -1
     GetName():               Oil Rig
     CanBuildIndustry():      false
     CanProspectIndustry():   false
@@ -6964,7 +6964,7 @@
     Id:                      11
     IsRawIndustry():         true
     ProductionCanIncrease(): false
-    GetConstructionCost():   747070
+    GetConstructionCost():   -1
     GetName():               Oil Wells
     CanBuildIndustry():      false
     CanProspectIndustry():   false
@@ -6984,7 +6984,7 @@
     Id:                      3
     IsRawIndustry():         true
     ProductionCanIncrease(): true
-    GetConstructionCost():   747070
+    GetConstructionCost():   -1
     GetName():               Forest
     CanBuildIndustry():      false
     CanProspectIndustry():   false
@@ -7004,7 +7004,7 @@
     Id:                      18
     IsRawIndustry():         true
     ProductionCanIncrease(): true
-    GetConstructionCost():   747070
+    GetConstructionCost():   -1
     GetName():               Iron Ore Mine
     CanBuildIndustry():      false
     CanProspectIndustry():   false
@@ -7014,7 +7014,7 @@
     Id:                      0
     IsRawIndustry():         true
     ProductionCanIncrease(): true
-    GetConstructionCost():   747070
+    GetConstructionCost():   -1
     GetName():               Coal Mine
     CanBuildIndustry():      false
     CanProspectIndustry():   false
diff --git a/src/ai/api/ai_industrytype.cpp b/src/ai/api/ai_industrytype.cpp
index 1f20845651..8bf892c8eb 100644
--- a/src/ai/api/ai_industrytype.cpp
+++ b/src/ai/api/ai_industrytype.cpp
@@ -39,7 +39,8 @@
 
 /* static */ Money AIIndustryType::GetConstructionCost(IndustryType industry_type)
 {
-	if (!IsValidIndustryType(industry_type)) return false;
+	if (!IsValidIndustryType(industry_type)) return -1;
+	if (::GetIndustrySpec(industry_type)->IsRawIndustry() && _settings_game.construction.raw_industry_construction == 0) return -1;
 
 	return ::GetIndustrySpec(industry_type)->GetConstructionCost();
 }