diff --git a/source/glest_game/ai/ai.cpp b/source/glest_game/ai/ai.cpp
index d51f5b56..81060790 100644
--- a/source/glest_game/ai/ai.cpp
+++ b/source/glest_game/ai/ai.cpp
@@ -663,7 +663,7 @@ bool Ai::findPosForBuilding(const UnitType* building, const Vec2i &searchPos, Ve
         for(int i=searchPos.x - currRadius; i < searchPos.x + currRadius; ++i) {
             for(int j=searchPos.y - currRadius; j < searchPos.y + currRadius; ++j) {
                 outPos= Vec2i(i, j);
-                if(aiInterface->isFreeCells(outPos - Vec2i(minBuildSpacing), building->getSize() + minBuildSpacing * 2, fLand)) {
+                if(aiInterface->isFreeCells(outPos - Vec2i(minBuildSpacing), building->getAiBuildSize() + minBuildSpacing * 2, fLand)) {
                		return true;
                 }
             }
diff --git a/source/glest_game/types/unit_type.cpp b/source/glest_game/types/unit_type.cpp
index cde886bb..be0deae6 100644
--- a/source/glest_game/types/unit_type.cpp
+++ b/source/glest_game/types/unit_type.cpp
@@ -141,6 +141,7 @@ UnitType::UnitType() : ProducibleType() {
 	armor=0;
 	sight=0;
 	size=0;
+	aiBuildSize=-1;
 	renderSize=0;
 	height=0;
 	burnHeight=0;
@@ -233,6 +234,10 @@ void UnitType::loaddd(int id,const string &dir, const TechTree *techTree,
 		if(parametersNode->hasChild("render-size")){
 			renderSize=parametersNode->getChild("render-size")->getAttribute("value")->getIntValue();
 		}
+		aiBuildSize=size;
+		if(parametersNode->hasChild("ai-build-size")){
+			aiBuildSize= parametersNode->getChild("ai-build-size")->getAttribute("value")->getIntValue();
+		}
 
 		//height
 		//checkItemInVault(&(this->height),this->height);
diff --git a/source/glest_game/types/unit_type.h b/source/glest_game/types/unit_type.h
index 27604710..fced61b1 100644
--- a/source/glest_game/types/unit_type.h
+++ b/source/glest_game/types/unit_type.h
@@ -196,6 +196,7 @@ private:
     bool commandable;
     int sight;
     int size;							//size in cells
+    int aiBuildSize;
     int renderSize;						//size to render in cells
     int height;
     int burnHeight;
@@ -288,6 +289,7 @@ public:
 	inline bool isCommandable() const							{return commandable;}
 	inline int getSight() const								{return sight;}
 	inline int getSize() const									{return size;}
+	inline int getAiBuildSize() const							{return aiBuildSize;}
 	inline int getRenderSize() const								{return renderSize;}
 	int getHeight() const										{return height;}
 	int getBurnHeight() const								{return burnHeight;}