diff --git a/src/devices/bus/isa/3c505.cpp b/src/devices/bus/isa/3c505.cpp
index a50c28b2c1b..2863135885a 100644
--- a/src/devices/bus/isa/3c505.cpp
+++ b/src/devices/bus/isa/3c505.cpp
@@ -405,7 +405,8 @@ void isa16_3c505_device::acr_w(u8 data)
 	if ((data ^ m_acr) & ACR_LED2)
 		m_led[1] = bool(data & ACR_LED2);
 
-	m_net->reset_w((data & ACR_R586) ? 1 : 0);
+	if ((data ^ m_acr) & ACR_R586)
+		m_net->reset_w((data & ACR_R586) ? 1 : 0);
 
 	if ((data ^ m_acr) & ACR_FLSH)
 	{