diff --git a/src/display.cpp b/src/display.cpp
index 0fc00642e85..7996316f3b5 100644
--- a/src/display.cpp
+++ b/src/display.cpp
@@ -2125,7 +2125,7 @@ static void dealWithLMBDClick()
 		{
 			/* We clicked on structure */
 			psStructure = (STRUCTURE *) psClickedOn;
-			if (psStructure->player == selectedPlayer && !structureIsBlueprint(psStructure))
+			if (psStructure->player == selectedPlayer && !psStructure->isBlueprint())
 			{
 				if (psStructure->isFactory())
 				{
@@ -2277,7 +2277,7 @@ static void dealWithRMB()
 					triggerEventSelected();
 					jsDebugSelected(psStructure);
 				}
-				else if (!structureIsBlueprint(psStructure))
+				else if (!psStructure->isBlueprint())
 				{
 					clearSelection();
 
diff --git a/src/display3d.cpp b/src/display3d.cpp
index 63cbfe790bb..b126ceae44c 100644
--- a/src/display3d.cpp
+++ b/src/display3d.cpp
@@ -746,7 +746,7 @@ static PIELIGHT structureBrightness(STRUCTURE *psStructure)
 {
 	PIELIGHT buildingBrightness;
 
-	if (structureIsBlueprint(psStructure))
+	if (psStructure->isBlueprint())
 	{
 		buildingBrightness = getBlueprintColour(psStructure->status);
 	}
@@ -2663,7 +2663,7 @@ static void renderStructureTurrets(STRUCTURE *psStructure, iIMDShape *strImd, PI
 	}
 
 	// flags for drawing weapons
-	if (structureIsBlueprint(psStructure))
+	if (psStructure->isBlueprint())
 	{
 		pieFlag = pie_TRANSLUCENT;
 		pieFlagData = BLUEPRINT_OPACITY;
@@ -2874,7 +2874,7 @@ void renderStructure(STRUCTURE *psStructure, const glm::mat4 &viewMatrix, const
 		/* Draw the building's base first */
 		if (psStructure->pStructureType->pBaseIMD != nullptr)
 		{
-			if (structureIsBlueprint(psStructure))
+			if (psStructure->isBlueprint())
 			{
 				pieFlagData = BLUEPRINT_OPACITY;
 			}
@@ -2920,7 +2920,7 @@ void renderStructure(STRUCTURE *psStructure, const glm::mat4 &viewMatrix, const
 		return;
 	}
 
-	if (structureIsBlueprint(psStructure))
+	if (psStructure->isBlueprint())
 	{
 		pieFlag = pie_TRANSLUCENT;
 		pieFlagData = BLUEPRINT_OPACITY;
@@ -2941,7 +2941,7 @@ void renderStructure(STRUCTURE *psStructure, const glm::mat4 &viewMatrix, const
 	while (strImd)
 	{
 		float stretch = 0.f;
-		if (defensive && !structureIsBlueprint(psStructure) && !(strImd->flags & iV_IMD_NOSTRETCH))
+		if (defensive && !psStructure->isBlueprint() && !(strImd->flags & iV_IMD_NOSTRETCH))
 		{
 			stretch = psStructure->pos.z - psStructure->foundationDepth;
 		}
@@ -3049,7 +3049,7 @@ static bool renderWallSection(STRUCTURE *psStructure, const glm::mat4 &viewMatri
 	}
 	else
 	{
-		if (structureIsBlueprint(psStructure))
+		if (psStructure->isBlueprint())
 		{
 			pieFlag = pie_TRANSLUCENT;
 			pieFlagData = BLUEPRINT_OPACITY;
diff --git a/src/structure.cpp b/src/structure.cpp
index 1dce1b02b27..3f9e7335bc2 100644
--- a/src/structure.cpp
+++ b/src/structure.cpp
@@ -226,17 +226,17 @@ static int numStructureModules(STRUCTURE const *psStruct)
 	return psStruct->capacity;
 }
 
-bool structureIsBlueprint(const STRUCTURE *psStructure)
+bool STRUCTURE::isBlueprint() const
 {
-	return (psStructure->status == SS_BLUEPRINT_VALID ||
-	        psStructure->status == SS_BLUEPRINT_INVALID ||
-	        psStructure->status == SS_BLUEPRINT_PLANNED ||
-	        psStructure->status == SS_BLUEPRINT_PLANNED_BY_ALLY);
+	return (status == SS_BLUEPRINT_VALID ||
+	        status == SS_BLUEPRINT_INVALID ||
+	        status == SS_BLUEPRINT_PLANNED ||
+	        status == SS_BLUEPRINT_PLANNED_BY_ALLY);
 }
 
 bool isBlueprint(const BASE_OBJECT *psObject)
 {
-	return psObject != nullptr && psObject->type == OBJ_STRUCTURE && structureIsBlueprint((const STRUCTURE *)psObject);
+	return psObject != nullptr && psObject->type == OBJ_STRUCTURE && ((const STRUCTURE*)psObject)->isBlueprint();
 }
 
 void initStructLimits()
diff --git a/src/structure.h b/src/structure.h
index 7db3fe24cff..8056d7491ce 100644
--- a/src/structure.h
+++ b/src/structure.h
@@ -317,7 +317,6 @@ void changeProductionPlayer(UBYTE player);
 bool IsStatExpansionModule(const STRUCTURE_STATS *psStats);
 
 /// is this a blueprint and not a real structure?
-bool structureIsBlueprint(const STRUCTURE *psStructure);
 bool isBlueprint(const BASE_OBJECT *psObject);
 
 /*returns the power cost to build this structure, or to add its next module */
diff --git a/src/structuredef.h b/src/structuredef.h
index 1c32c2610a2..40ecdcb40f4 100644
--- a/src/structuredef.h
+++ b/src/structuredef.h
@@ -287,6 +287,8 @@ struct STRUCTURE : public BASE_OBJECT
 	uint32_t structureBody() const;
 	// Just returns true if the structure's present body points aren't as high as the original
 	bool isDamaged() const;
+	// is this a blueprint and not a real structure?
+	bool isBlueprint() const;
 
 	STRUCTURE_STATS     *pStructureType;            /* pointer to the structure stats for this type of building */
 	STRUCT_STATES       status;                     /* defines whether the structure is being built, doing nothing or performing a function */