diff --git a/src/emu/cpu/f8/f8.c b/src/emu/cpu/f8/f8.c
index c5c1dee0a0b..edd2e433cca 100644
--- a/src/emu/cpu/f8/f8.c
+++ b/src/emu/cpu/f8/f8.c
@@ -75,7 +75,15 @@ f8_cpu_device::f8_cpu_device(const machine_config &mconfig, const char *tag, dev
 	: cpu_device(mconfig, F8, "Fairchild F8", tag, owner, clock, "f8", __FILE__)
 	, m_program_config("program", ENDIANNESS_BIG, 8, 16, 0)
 	, m_io_config("io", ENDIANNESS_BIG, 8, 8, 0)
+	, m_pc0(0)
+	, m_pc1(0)
+	, m_dc0(0)
+	, m_dc1(0)
+	, m_a(0)
+	, m_w(0)
+	, m_is(0)
 {
+	memset(m_r, 0x00, sizeof(m_r));
 }