diff --git a/src/devices/cpu/tms9900/tms9980a.cpp b/src/devices/cpu/tms9900/tms9980a.cpp
index af4db7998e9..949ad8df9a0 100644
--- a/src/devices/cpu/tms9900/tms9980a.cpp
+++ b/src/devices/cpu/tms9900/tms9980a.cpp
@@ -79,11 +79,10 @@
 
 /****************************************************************************
     Constructor
-    The external clock is divided by 4 internally
 ****************************************************************************/
 
 tms9980a_device::tms9980a_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
-	: tms99xx_device(mconfig, type, tag, 8, 14, 11, owner, clock / 4 )
+	: tms99xx_device(mconfig, type, tag, 8, 14, 11, owner, clock)
 {
 }