diff --git a/src/emu/xtal.cpp b/src/emu/xtal.cpp
index 14e5322ed55..1083179e588 100644
--- a/src/emu/xtal.cpp
+++ b/src/emu/xtal.cpp
@@ -361,7 +361,7 @@ const double XTAL::known_xtals[] = {
 	 51'200'000, /* 51.2_MHz_XTAL          Namco Super System 22 video clock */
 	 52'000'000, /* 52_MHz_XTAL            Cojag */
 	 52'832'000, /* 52.832_MHz_XTAL        Wang PC TIG video controller */
-	 53'203'400, /* 53.2034_MHz_XTAL       Master System, Mega Drive PAL (~12x PAL subcarrier) */
+	 53'203'424, /* 53.203424_MHz_XTAL     Master System, Mega Drive PAL (12x PAL subcarrier) */
 	 53'693'175, /* 53.693175_MHz_XTAL     PSX-based h/w, Sony ZN1-2-based (15x NTSC subcarrier) */
 	 54'000'000, /* 54_MHz_XTAL            Taito JC */
 	 55'000'000, /* 55_MHz_XTAL            Eolith Vega */