diff --git a/src/emu/xtal.h b/src/emu/xtal.h
index 8e2f6db053a..4ce24b9323b 100644
--- a/src/emu/xtal.h
+++ b/src/emu/xtal.h
@@ -81,8 +81,8 @@ constexpr XTAL operator *(unsigned int mult, const XTAL &xtal) { return XTAL(xta
 constexpr XTAL operator *(double       mult, const XTAL &xtal) { return XTAL(xtal.base(), mult * xtal.dvalue()); }
 
 constexpr XTAL operator ""_Hz_XTAL(long double clock) { return XTAL(double(clock)); }
-constexpr XTAL operator ""_kHz_XTAL(long double clock) { return XTAL(double(clock * 1e3)); }
-constexpr XTAL operator ""_MHz_XTAL(long double clock) { return XTAL(double(clock * 1e6)); }
+constexpr XTAL operator ""_kHz_XTAL(long double clock) { return XTAL(double(clock) * 1e3); }
+constexpr XTAL operator ""_MHz_XTAL(long double clock) { return XTAL(double(clock) * 1e6); }
 
 constexpr XTAL operator ""_Hz_XTAL(unsigned long long clock) { return XTAL(double(clock)); }
 constexpr XTAL operator ""_kHz_XTAL(unsigned long long clock) { return XTAL(double(clock) * 1e3); }