diff --git a/rts/Sim/Units/UnitTypes/Builder.cpp b/rts/Sim/Units/UnitTypes/Builder.cpp
index 60961262f8f..e042c696fc2 100644
--- a/rts/Sim/Units/UnitTypes/Builder.cpp
+++ b/rts/Sim/Units/UnitTypes/Builder.cpp
@@ -577,6 +577,9 @@ bool CBuilder::StartBuild(BuildInfo& buildInfo, CFeature*& feature)
 	const UnitDef* unitDef = buildInfo.def;
 	SetBuildStanceToward(buildInfo.pos);
 
+	if (!inBuildStance)
+		return false;
+
 	CUnit* b = unitLoader.LoadUnit(buildInfo.def, buildInfo.pos, team,
 	                               true, buildInfo.buildFacing, this);