diff --git a/gen/main.go b/gen/main.go
index f82c120..dcb1b80 100644
--- a/gen/main.go
+++ b/gen/main.go
@@ -134,7 +134,7 @@ func generate(typ *def.Class, opt options) string {
 	res += generateBinding(typ, opt)
 
 	if opt.cpool {
-		res += fmt.Sprintf("type %s uint32\n", refName(typ))
+		res += fmt.Sprintf("type %s uint64\n", refName(typ))
 		res += fmt.Sprintf("type %s struct {\n", listName(typ))
 		if opt.doNotKeepData {
 
diff --git a/parser/types/class.go b/parser/types/class.go
index 72b2302..0f552b9 100644
--- a/parser/types/class.go
+++ b/parser/types/class.go
@@ -46,7 +46,7 @@ func NewBindClass(typ *def.Class, typeMap *def.TypeMap) *BindClass {
 	return res
 }
 
-type ClassRef uint32
+type ClassRef uint64
 type ClassList struct {
 	IDMap map[ClassRef]uint32
 	Class []Class
diff --git a/parser/types/classloader.go b/parser/types/classloader.go
index 0f5ee84..f453186 100644
--- a/parser/types/classloader.go
+++ b/parser/types/classloader.go
@@ -44,7 +44,7 @@ func NewBindClassLoader(typ *def.Class, typeMap *def.TypeMap) *BindClassLoader {
 	return res
 }
 
-type ClassLoaderRef uint32
+type ClassLoaderRef uint64
 type ClassLoaderList struct {
 	IDMap       map[ClassLoaderRef]uint32
 	ClassLoader []ClassLoader
diff --git a/parser/types/frametype.go b/parser/types/frametype.go
index 9d1afda..59d1097 100644
--- a/parser/types/frametype.go
+++ b/parser/types/frametype.go
@@ -37,7 +37,7 @@ func NewBindFrameType(typ *def.Class, typeMap *def.TypeMap) *BindFrameType {
 	return res
 }
 
-type FrameTypeRef uint32
+type FrameTypeRef uint64
 type FrameTypeList struct {
 	IDMap     map[FrameTypeRef]uint32
 	FrameType []FrameType
diff --git a/parser/types/loglevel.go b/parser/types/loglevel.go
index 3ba3149..b907653 100644
--- a/parser/types/loglevel.go
+++ b/parser/types/loglevel.go
@@ -37,7 +37,7 @@ func NewBindLogLevel(typ *def.Class, typeMap *def.TypeMap) *BindLogLevel {
 	return res
 }
 
-type LogLevelRef uint32
+type LogLevelRef uint64
 type LogLevelList struct {
 	IDMap    map[LogLevelRef]uint32
 	LogLevel []LogLevel
diff --git a/parser/types/method.go b/parser/types/method.go
index 4706f62..6c0464d 100644
--- a/parser/types/method.go
+++ b/parser/types/method.go
@@ -52,7 +52,7 @@ func NewBindMethod(typ *def.Class, typeMap *def.TypeMap) *BindMethod {
 	return res
 }
 
-type MethodRef uint32
+type MethodRef uint64
 type MethodList struct {
 	IDMap  IDMap[MethodRef]
 	Method []Method
diff --git a/parser/types/package.go b/parser/types/package.go
index b78b2ae..4feaa18 100644
--- a/parser/types/package.go
+++ b/parser/types/package.go
@@ -37,7 +37,7 @@ func NewBindPackage(typ *def.Class, typeMap *def.TypeMap) *BindPackage {
 	return res
 }
 
-type PackageRef uint32
+type PackageRef uint64
 type PackageList struct {
 	IDMap   map[PackageRef]uint32
 	Package []Package
diff --git a/parser/types/skipper.go b/parser/types/skipper.go
index 3651e3d..9fd3169 100644
--- a/parser/types/skipper.go
+++ b/parser/types/skipper.go
@@ -30,7 +30,7 @@ func NewBindSkipConstantPool(typ *def.Class, typeMap *def.TypeMap) *BindSkipCons
 	return res
 }
 
-type SkipConstantPoolRef uint32
+type SkipConstantPoolRef uint64
 type SkipConstantPoolList struct {
 }
 
diff --git a/parser/types/stacktrace.go b/parser/types/stacktrace.go
index 3b7cd42..c9ca6de 100644
--- a/parser/types/stacktrace.go
+++ b/parser/types/stacktrace.go
@@ -44,7 +44,7 @@ func NewBindStackTrace(typ *def.Class, typeMap *def.TypeMap) *BindStackTrace {
 	return res
 }
 
-type StackTraceRef uint32
+type StackTraceRef uint64
 type StackTraceList struct {
 	IDMap      map[StackTraceRef]uint32
 	StackTrace []StackTrace
diff --git a/parser/types/symbol.go b/parser/types/symbol.go
index cc69892..6ef4bc2 100644
--- a/parser/types/symbol.go
+++ b/parser/types/symbol.go
@@ -37,7 +37,7 @@ func NewBindSymbol(typ *def.Class, typeMap *def.TypeMap) *BindSymbol {
 	return res
 }
 
-type SymbolRef uint32
+type SymbolRef uint64
 type SymbolList struct {
 	IDMap  map[SymbolRef]uint32
 	Symbol []Symbol
diff --git a/parser/types/threadstate.go b/parser/types/threadstate.go
index 7d46519..c10e411 100644
--- a/parser/types/threadstate.go
+++ b/parser/types/threadstate.go
@@ -37,7 +37,7 @@ func NewBindThreadState(typ *def.Class, typeMap *def.TypeMap) *BindThreadState {
 	return res
 }
 
-type ThreadStateRef uint32
+type ThreadStateRef uint64
 type ThreadStateList struct {
 	IDMap       map[ThreadStateRef]uint32
 	ThreadState []ThreadState