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-rw-r--r--src/emu/xtal.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/xtal.cpp b/src/emu/xtal.cpp
index 0e47cffa87a..2e02b4ab0e0 100644
--- a/src/emu/xtal.cpp
+++ b/src/emu/xtal.cpp
@@ -504,7 +504,7 @@ void XTAL::validate(const std::string &message) const
fail(m_base_clock, message);
}
-void XTAL::fail(double base_clock, std::string message)
+void XTAL::fail(double base_clock, const std::string &message)
{
std::string full_message = util::string_format("Unknown crystal value %.0f. ", base_clock);
if(xtal_error_low && xtal_error_high)