diff --git a/spice/vd_agent.h b/spice/vd_agent.h
index 061ca30..779f4f3 100644
--- a/spice/vd_agent.h
+++ b/spice/vd_agent.h
@@ -268,6 +268,9 @@ typedef struct SPICE_ATTR_PACKED VDAgentAnnounceCapabilities {
 #define VD_AGENT_SET_CAPABILITY(caps, index) \
     { (caps)[(index) / 32] |= (1 << ((index) % 32)); }
 
+#define VD_AGENT_CLEAR_CAPABILITY(caps, index) \
+    { (caps)[(index) / 32] &= ~(1 << ((index) % 32)); }
+
 #include <spice/end-packed.h>
 
 #endif /* _H_VD_AGENT */