diff --git a/src/emu/machine/pccard.h b/src/emu/machine/pccard.h
index 86ff04e925c..f15ef7630f6 100644
--- a/src/emu/machine/pccard.h
+++ b/src/emu/machine/pccard.h
@@ -12,6 +12,8 @@ public:
 	virtual DECLARE_READ16_MEMBER(read_reg);
 	virtual DECLARE_WRITE16_MEMBER(write_memory);
 	virtual DECLARE_WRITE16_MEMBER(write_reg);
+
+	virtual ~pccard_interface() {}
 };
 
 extern const device_type PCCARD_SLOT;
diff --git a/src/mame/machine/k573cass.h b/src/mame/machine/k573cass.h
index 29a53355855..77145a2ffd9 100644
--- a/src/mame/machine/k573cass.h
+++ b/src/mame/machine/k573cass.h
@@ -32,6 +32,8 @@ public:
 	virtual DECLARE_READ_LINE_MEMBER(read_line_dsr);
 	virtual DECLARE_READ_LINE_MEMBER(read_line_adc083x_do);
 	virtual DECLARE_READ_LINE_MEMBER(read_line_adc083x_sars);
+
+	virtual ~konami573_cassette_interface() {}
 };