diff --git a/src/bonsai/bonsai/tool/drawing.py b/src/bonsai/bonsai/tool/drawing.py
index 1e5a70f77c..41f5ebc356 100644
--- a/src/bonsai/bonsai/tool/drawing.py
+++ b/src/bonsai/bonsai/tool/drawing.py
@@ -682,6 +682,7 @@ class Drawing(bonsai.core.tool.Drawing):
     @classmethod
     def generate_sheet_identification(cls) -> str:
         number = len([d for d in tool.Ifc.get().by_type("IfcDocumentInformation") if d.Scope == "SHEET"])
+        number += 1
         return "A" + str(number).zfill(2)
 
     @classmethod
diff --git a/src/bonsai/test/tool/test_drawing.py b/src/bonsai/test/tool/test_drawing.py
index b5d7537b0f..c7baa6a391 100644
--- a/src/bonsai/test/tool/test_drawing.py
+++ b/src/bonsai/test/tool/test_drawing.py
@@ -478,9 +478,9 @@ class TestGenerateSheetIdentification(NewFile):
     def test_run(self):
         ifc = ifcopenshell.file()
         tool.Ifc.set(ifc)
-        subject.generate_sheet_identification() == "A01"
+        assert subject.generate_sheet_identification() == "A01"
         document = ifc.createIfcDocumentInformation()
-        subject.generate_sheet_identification() == "A02"
+        assert subject.generate_sheet_identification() == "A02"
 
 
 class TestGetTextLiteral(NewFile):
diff --git a/src/bonsai/test/tool/test_system.py b/src/bonsai/test/tool/test_system.py
index 40e54d67b7..5ed7eab16d 100644
--- a/src/bonsai/test/tool/test_system.py
+++ b/src/bonsai/test/tool/test_system.py
@@ -164,7 +164,7 @@ class TestGetPorts(NewFile):
         element = ifc.createIfcDuctSegment()
         port = ifc.createIfcDistributionPort()
         ifcopenshell.api.run("system.assign_port", ifc, element=element, port=port)
-        subject.get_ports(element) == [port]
+        assert subject.get_ports(element) == [port]
 
 
 class TestImportSystemAttributes(NewFile):