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-rw-r--r--src/devices/cpu/alto2/alto2cpu.cpp2
-rw-r--r--src/devices/cpu/alto2/alto2cpu.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/devices/cpu/alto2/alto2cpu.cpp b/src/devices/cpu/alto2/alto2cpu.cpp
index 6b35a076ec3..a3538dee290 100644
--- a/src/devices/cpu/alto2/alto2cpu.cpp
+++ b/src/devices/cpu/alto2/alto2cpu.cpp
@@ -1002,7 +1002,7 @@ void alto2_cpu_device::device_start()
// for the debugger
//-------------------------------------------------
-void alto2_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void alto2_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
{
switch (entry.index())
{
diff --git a/src/devices/cpu/alto2/alto2cpu.h b/src/devices/cpu/alto2/alto2cpu.h
index 9a9fdf0d031..071cbd3cb2a 100644
--- a/src/devices/cpu/alto2/alto2cpu.h
+++ b/src/devices/cpu/alto2/alto2cpu.h
@@ -213,7 +213,7 @@ protected:
//! device (P)ROMs
virtual const rom_entry *device_rom_region() const override;
//! device_state_interface overrides
- void state_string_export(const device_state_entry &entry, std::string &str) override;
+ void state_string_export(const device_state_entry &entry, std::string &str) const override;
//! device_disasm_interface overrides
virtual UINT32 disasm_min_opcode_bytes() const override { return 4; }