diff --git a/source/blender/blenkernel/BKE_modifier.h b/source/blender/blenkernel/BKE_modifier.h
index 931f0e12fd4..4b679c1587f 100644
--- a/source/blender/blenkernel/BKE_modifier.h
+++ b/source/blender/blenkernel/BKE_modifier.h
@@ -292,6 +292,7 @@ struct Object *modifiers_isDeformedByArmature(struct Object *ob);
 struct Object *modifiers_isDeformedByLattice(struct Object *ob);
 int           modifiers_usesArmature(struct Object *ob, struct bArmature *arm);
 int           modifiers_isDeformed(struct Object *ob);
+void          modifier_freeTemporaryData(struct ModifierData *md);
 
 int           modifiers_indexInObject(struct Object *ob, struct ModifierData *md);
 
diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index 4cc134476e4..61ad1bd0ebf 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -1877,7 +1877,7 @@ static void mesh_calc_modifiers(Object *ob, float (*inputVertexCos)[3],
                                 int needMapping, CustomDataMask dataMask)
 {
 	Mesh *me = ob->data;
-	ModifierData *md = modifiers_getVirtualModifierList(ob);
+	ModifierData *firstmd, *md;
 	LinkNode *datamasks, *curr;
 	CustomDataMask mask;
 	float (*deformedVerts)[3] = NULL;
@@ -1886,6 +1886,8 @@ static void mesh_calc_modifiers(Object *ob, float (*inputVertexCos)[3],
 	int fluidsimMeshUsed = 0;
 	int required_mode;
 
+	md = firstmd = modifiers_getVirtualModifierList(ob);
+
 	modifiers_clearErrors(ob);
 
 	/* we always want to keep original indices */
@@ -2097,6 +2099,9 @@ static void mesh_calc_modifiers(Object *ob, float (*inputVertexCos)[3],
 		}
 	}
 
+	for(md=first; md; md=md->next)
+		modifier_freeTemporaryData(md);
+
 	/* Yay, we are done. If we have a DerivedMesh and deformed vertices
 	 * need to apply these back onto the DerivedMesh. If we have no
 	 * DerivedMesh then we need to build one.
diff --git a/source/blender/blenkernel/intern/modifier.c b/source/blender/blenkernel/intern/modifier.c
index 4672b5d6da8..ad0092e1711 100644
--- a/source/blender/blenkernel/intern/modifier.c
+++ b/source/blender/blenkernel/intern/modifier.c
@@ -7219,3 +7219,14 @@ int modifiers_usesPointCache(Object *ob)
 	return 0;
 }
 
+void modifier_freeTemporaryData(ModifierData *md)
+{
+	if(md->type == eModifierType_Armature) {
+		ArmatureModifierData *amd= (ArmatureModifierData*)md;
+
+		if(amd->prevCos)
+			MEM_freeN(amd->prevCos);
+	}
+}
+
+