diff --git a/src/ai/api/ai_object.cpp b/src/ai/api/ai_object.cpp
index 7282ba927e..e137faf1e6 100644
--- a/src/ai/api/ai_object.cpp
+++ b/src/ai/api/ai_object.cpp
@@ -215,7 +215,7 @@ bool AIObject::DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint cmd, const c
 	/* We failed; set the error and bail out */
 	if (res.Failed()) {
 		res.SetGlobalErrorMessage();
-		SetLastError(AIError::StringToError(_error_message));
+		SetLastError(AIError::StringToError(res.GetErrorMessage()));
 		return false;
 	}
 
diff --git a/src/bridge_gui.cpp b/src/bridge_gui.cpp
index cccfbeddeb..85b2e7b486 100644
--- a/src/bridge_gui.cpp
+++ b/src/bridge_gui.cpp
@@ -387,7 +387,7 @@ void ShowBuildBridgeWindow(TileIndex start, TileIndex end, TransportType transpo
 
 	GUIBridgeList *bl = NULL;
 	if (ret.Failed()) {
-		errmsg = _error_message;
+		errmsg = ret.GetErrorMessage();
 	} else {
 		/* check which bridges can be built */
 		const uint tot_bridgedata_len = CalcBridgeLenCostFactor(bridge_len + 2);
diff --git a/src/command.cpp b/src/command.cpp
index c716d7970a..73d8901c5a 100644
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -511,7 +511,7 @@ bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallbac
 		/* Only show the error when it's for us. */
 		StringID error_part1 = GB(cmd, 16, 16);
 		if (estimate_only || (IsLocalCompany() && error_part1 != 0 && my_cmd)) {
-			ShowErrorMessage(error_part1, _error_message, WL_INFO, x, y);
+			ShowErrorMessage(error_part1, res.GetErrorMessage(), WL_INFO, x, y);
 		}
 	} else if (estimate_only) {
 		ShowEstimatedCostOrIncome(res.GetCost(), x, y);