diff --git a/userspace/libsinsp/state/dynamic_struct.h b/userspace/libsinsp/state/dynamic_struct.h
index 6321a6b8dc..ac1d89c276 100644
--- a/userspace/libsinsp/state/dynamic_struct.h
+++ b/userspace/libsinsp/state/dynamic_struct.h
@@ -261,7 +261,7 @@ class dynamic_struct {
 	 * @brief Accesses a field with the given accessor and reads its value.
 	 */
 	template<typename T, typename Val = T>
-	inline void get_dynamic_field(const field_accessor<T>& a, Val& out) {
+	inline void get_dynamic_field(const field_accessor<T>& a, Val& out) const {
 		_check_defsptr(a.info(), false);
 		get_dynamic_field(a.info(), reinterpret_cast<void*>(&out));
 	}
@@ -308,7 +308,7 @@ class dynamic_struct {
 	 * according to the type definitions supported in libsinsp::state::typeinfo.
 	 * For strings, "out" is considered of type const char**.
 	 */
-	virtual void get_dynamic_field(const field_info& i, void* out) {
+	virtual void get_dynamic_field(const field_info& i, void* out) const {
 		const auto* buf = _access_dynamic_field(i.m_index);
 		if(i.info().type_id() == SS_PLUGIN_ST_STRING) {
 			*((const char**)out) = ((const std::string*)buf)->c_str();
@@ -360,7 +360,7 @@ class dynamic_struct {
 		}
 	}
 
-	inline void* _access_dynamic_field(size_t index) {
+	inline void* _access_dynamic_field(size_t index) const {
 		if(!m_dynamic_fields) {
 			throw sinsp_exception("dynamic struct has no field definitions");
 		}
@@ -397,7 +397,7 @@ class dynamic_struct {
 		}
 	}
 
-	std::vector<void*> m_fields;
+	mutable std::vector<void*> m_fields;
 	std::shared_ptr<field_infos> m_dynamic_fields;
 };
 
@@ -409,7 +409,7 @@ class dynamic_struct {
 template<>
 inline void libsinsp::state::dynamic_struct::get_dynamic_field<std::string, const char*>(
         const field_accessor<std::string>& a,
-        const char*& out) {
+        const char*& out) const {
 	_check_defsptr(a.info(), false);
 	get_dynamic_field(a.info(), reinterpret_cast<void*>(&out));
 }
@@ -417,7 +417,7 @@ inline void libsinsp::state::dynamic_struct::get_dynamic_field<std::string, cons
 template<>
 inline void libsinsp::state::dynamic_struct::get_dynamic_field<std::string, std::string>(
         const field_accessor<std::string>& a,
-        std::string& out) {
+        std::string& out) const {
 	const char* s = NULL;
 	get_dynamic_field(a, s);
 	if(!s) {
diff --git a/userspace/libsinsp/state/table_adapters.h b/userspace/libsinsp/state/table_adapters.h
index 27fcaf2410..219c964fdb 100644
--- a/userspace/libsinsp/state/table_adapters.h
+++ b/userspace/libsinsp/state/table_adapters.h
@@ -83,7 +83,8 @@ class pair_table_entry_adapter : public libsinsp::state::table_entry {
 	inline void set_value(std::pair<Tfirst, Tsecond>* v) { m_value = v; }
 
 protected:
-	virtual void get_dynamic_field(const dynamic_struct::field_info& i, void* out) override final {
+	virtual void get_dynamic_field(const dynamic_struct::field_info& i,
+	                               void* out) const override final {
 		if(i.index() > 1 || i.defs_id() != s_dynamic_fields_id) {
 			throw sinsp_exception(
 			        "invalid field info passed to pair_table_entry_adapter::get_dynamic_field");
@@ -115,7 +116,9 @@ class pair_table_entry_adapter : public libsinsp::state::table_entry {
 	std::pair<Tfirst, Tsecond>* m_value;
 
 	template<typename T>
-	inline void get_dynamic_field(const dynamic_struct::field_info& i, const T* value, void* out) {
+	inline void get_dynamic_field(const dynamic_struct::field_info& i,
+	                              const T* value,
+	                              void* out) const {
 		if(i.info().type_id() == SS_PLUGIN_ST_STRING) {
 			*((const char**)out) = ((const std::string*)value)->c_str();
 		} else {
@@ -169,7 +172,8 @@ class value_table_entry_adapter : public libsinsp::state::table_entry {
 	inline void set_value(T* v) { m_value = v; }
 
 protected:
-	virtual void get_dynamic_field(const dynamic_struct::field_info& i, void* out) override final {
+	virtual void get_dynamic_field(const dynamic_struct::field_info& i,
+	                               void* out) const override final {
 		if(i.index() != 0 || i.defs_id() != s_dynamic_fields_id) {
 			throw sinsp_exception(
 			        "invalid field info passed to value_table_entry_adapter::get_dynamic_field");
diff --git a/userspace/libsinsp/threadinfo.cpp b/userspace/libsinsp/threadinfo.cpp
index e10257445a..ebe6f764ce 100644
--- a/userspace/libsinsp/threadinfo.cpp
+++ b/userspace/libsinsp/threadinfo.cpp
@@ -407,7 +407,7 @@ std::string sinsp_threadinfo::get_exepath() const {
 	return m_exepath;
 }
 
-std::string sinsp_threadinfo::get_container_id() {
+std::string sinsp_threadinfo::get_container_id() const {
 	std::string container_id;
 
 	const auto accessor = m_params->thread_manager->get_field_accessor(
diff --git a/userspace/libsinsp/threadinfo.h b/userspace/libsinsp/threadinfo.h
index eb08780a5f..d86811b075 100644
--- a/userspace/libsinsp/threadinfo.h
+++ b/userspace/libsinsp/threadinfo.h
@@ -115,7 +115,7 @@ class SINSP_PUBLIC sinsp_threadinfo : public libsinsp::state::table_entry {
 	  \brief Return the container_id associated with this thread, if the container plugins is
 	  running, leveraging sinsp state table API.
 	*/
-	std::string get_container_id();
+	std::string get_container_id() const;
 
 	/*!
 	  \brief Given the container_id associated with this thread, feetches the container user from