diff --git a/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala
index 1654a4ae0..073c041e6 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala
@@ -495,9 +495,9 @@ class CSharpCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
 
   //</editor-fold>
 
-  override def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
-    out.puts(s"private bool ${flagForInstName(attrName)};")
-    out.puts(s"private ${kaitaiType2NativeTypeNullable(attrType, isNullable)} ${privateMemberName(attrName)};")
+  override def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
+    out.puts(s"private bool ${flagForInstName(instName)};")
+    out.puts(s"private ${kaitaiType2NativeTypeNullable(attrType, isNullable)} ${privateMemberName(instName)};")
   }
 
   override def instanceHeader(className: String, instName: InstanceIdentifier, dataType: DataType, isNullable: Boolean): Unit = {
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala
index 1710e36c5..d04e18381 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala
@@ -880,11 +880,11 @@ class CppCompiler(
 
   override def switchBytesOnlyAsRaw = true
 
-  override def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
+  override def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
     ensureMode(PrivateAccess)
-    outHdr.puts(s"bool ${calculatedFlagForName(attrName)};")
-    outHdr.puts(s"${kaitaiType2NativeType(attrType)} ${privateMemberName(attrName)};")
-    declareNullFlag(attrName, isNullable)
+    outHdr.puts(s"bool ${calculatedFlagForName(instName)};")
+    outHdr.puts(s"${kaitaiType2NativeType(attrType)} ${privateMemberName(instName)};")
+    declareNullFlag(instName, isNullable)
   }
 
   override def instanceHeader(className: List[String], instName: InstanceIdentifier, dataType: DataType, isNullable: Boolean): Unit = {
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
index 93ed4de2c..c8b5c66bb 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
@@ -470,9 +470,9 @@ class GoCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     out.inc
   }
 
-  override def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
-    out.puts(s"${calculatedFlagForName(attrName)} bool")
-    out.puts(s"${idToStr(attrName)} ${kaitaiType2NativeType(attrType)}")
+  override def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
+    out.puts(s"${calculatedFlagForName(instName)} bool")
+    out.puts(s"${idToStr(instName)} ${kaitaiType2NativeType(attrType)}")
   }
 
   override def instanceHeader(className: List[String], instName: InstanceIdentifier, dataType: DataType, isNullable: Boolean): Unit = {
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
index 289010f9f..bc9c1699d 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
@@ -656,8 +656,8 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
 
   //</editor-fold>
 
-  override def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
-    out.puts(s"private ${kaitaiType2JavaTypeBoxed(attrType)} ${idToStr(attrName)};")
+  override def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
+    out.puts(s"private ${kaitaiType2JavaTypeBoxed(attrType)} ${idToStr(instName)};")
   }
 
   override def instanceHeader(className: String, instName: InstanceIdentifier, dataType: DataType, isNullable: Boolean): Unit = {
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala
index 3fc4d0e07..f1d1e23a3 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala
@@ -121,9 +121,9 @@ class NimCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def attributeDeclaration(attrName: Identifier, attrType: DataType, isNullable: Boolean): Unit = {
     out.puts(s"`${idToStr(attrName)}`*: ${ksToNim(attrType)}")
   }
-  override def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
-    out.puts(s"`${idToStr(attrName)}`: ${ksToNim(attrType)}")
-    out.puts(s"`${instanceFlagIdentifier(attrName)}`: bool")
+  override def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
+    out.puts(s"`${idToStr(instName)}`: ${ksToNim(attrType)}")
+    out.puts(s"`${instanceFlagIdentifier(instName)}`: bool")
   }
   override def attributeReader(attrName: Identifier, attrType: DataType, isNullable: Boolean): Unit = {}
   override def classConstructorHeader(name: List[String], parentType: DataType, rootClassName: List[String], isHybrid: Boolean, params: List[ParamDefSpec]): Unit = {}
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala
index 2a460879a..98f638bd7 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala
@@ -427,8 +427,8 @@ class RustCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
 
   override def switchEnd(): Unit = universalFooter
 
-  override def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
-    out.puts(s"    pub ${idToStr(attrName)}: Option<${kaitaiType2NativeType(attrType)}>,")
+  override def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = {
+    out.puts(s"    pub ${idToStr(instName)}: Option<${kaitaiType2NativeType(attrType)}>,")
   }
 
   override def instanceDeclHeader(className: List[String]): Unit = {
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/components/LanguageCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/components/LanguageCompiler.scala
index 038a3d688..c2af6439e 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/components/LanguageCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/components/LanguageCompiler.scala
@@ -154,7 +154,8 @@ abstract class LanguageCompiler(
   def instanceDeclHeader(className: List[String]): Unit = {}
   def instanceClear(instName: InstanceIdentifier): Unit = {}
   def instanceSetCalculated(instName: InstanceIdentifier): Unit = {}
-  def instanceDeclaration(attrName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit = attributeDeclaration(attrName, attrType, isNullable)
+  def instanceDeclaration(instName: InstanceIdentifier, attrType: DataType, isNullable: Boolean): Unit =
+    attributeDeclaration(instName, attrType, isNullable)
   def instanceHeader(className: List[String], instName: InstanceIdentifier, dataType: DataType, isNullable: Boolean): Unit
   def instanceFooter: Unit
   def instanceCheckCacheAndReturn(instName: InstanceIdentifier, dataType: DataType): Unit