diff --git a/src/mame/galaxian/galaxian.cpp b/src/mame/galaxian/galaxian.cpp
index fb91e88533e..3ab398ec605 100644
--- a/src/mame/galaxian/galaxian.cpp
+++ b/src/mame/galaxian/galaxian.cpp
@@ -1639,7 +1639,7 @@ void sbhoei_state::sbhoei_soundlatch_w(uint8_t data)
 {
 	m_soundlatch->write(data & 0x7f);
 	m_8039->set_input_line(0, (data & 0x80) ? ASSERT_LINE : CLEAR_LINE);
-	machine().scheduler().perfect_quantum(attotime::from_usec(50)); // main CPU polls for response from 8039
+	machine().scheduler().perfect_quantum(attotime::from_usec(100)); // main CPU polls for response from 8039
 }
 
 void sbhoei_state::p2_w(uint8_t data)