diff --git a/src/ai/api/ai_industry.cpp b/src/ai/api/ai_industry.cpp
index a1493c0b5a..7c07535021 100644
--- a/src/ai/api/ai_industry.cpp
+++ b/src/ai/api/ai_industry.cpp
@@ -11,11 +11,6 @@
 #include "../../station_map.h"
 #include "table/strings.h"
 
-/* static */ IndustryID AIIndustry::GetMaxIndustryID()
-{
-	return ::GetMaxIndustryIndex();
-}
-
 /* static */ int32 AIIndustry::GetIndustryCount()
 {
 	return ::GetNumIndustries();
diff --git a/src/ai/api/ai_industry.hpp b/src/ai/api/ai_industry.hpp
index abaff2ea22..bf93cd4669 100644
--- a/src/ai/api/ai_industry.hpp
+++ b/src/ai/api/ai_industry.hpp
@@ -15,18 +15,10 @@ public:
 	static const char *GetClassName() { return "AIIndustry"; }
 
 	/**
-	 * Gets the maximum industry index; there are no valid industries with a
-	 *   higher index.
-	 * @return The maximum industry index.
-	 * @post Return value is always non-negative.
-	 */
-	static IndustryID GetMaxIndustryID();
-
-	/**
-	 * Gets the number of industries. This is different than GetMaxIndustryID()
-	 *   because of the way OpenTTD works internally.
+	 * Gets the number of industries.
 	 * @return The number of industries.
 	 * @post Return value is always non-negative.
+	 * @note The maximum valid IndustryID can be higher then the value returned.
 	 */
 	static int32 GetIndustryCount();
 
diff --git a/src/ai/api/ai_industry.hpp.sq b/src/ai/api/ai_industry.hpp.sq
index 2d50dd330b..2e93f177e5 100644
--- a/src/ai/api/ai_industry.hpp.sq
+++ b/src/ai/api/ai_industry.hpp.sq
@@ -17,7 +17,6 @@ void SQAIIndustry_Register(Squirrel *engine) {
 	SQAIIndustry.PreRegister(engine);
 	SQAIIndustry.AddConstructor<void (AIIndustry::*)(), 1>(engine, "x");
 
-	SQAIIndustry.DefSQStaticMethod(engine, &AIIndustry::GetMaxIndustryID,           "GetMaxIndustryID",           1, ".");
 	SQAIIndustry.DefSQStaticMethod(engine, &AIIndustry::GetIndustryCount,           "GetIndustryCount",           1, ".");
 	SQAIIndustry.DefSQStaticMethod(engine, &AIIndustry::IsValidIndustry,            "IsValidIndustry",            2, ".i");
 	SQAIIndustry.DefSQStaticMethod(engine, &AIIndustry::GetName,                    "GetName",                    2, ".i");