diff --git a/client/src/main.c b/client/src/main.c
index 54c4bf54..ddafeae2 100644
--- a/client/src/main.c
+++ b/client/src/main.c
@@ -758,16 +758,17 @@ int main_frameThread(void * unused)
       break;
     }
 
-    if (frame->requestActivation)
+    if (frame->flags && FRAME_FLAG_REQUEST_ACTIVATION)
       g_state.ds->requestActivation();
 
-    if (g_params.autoScreensaver && g_state.autoIdleInhibitState != frame->blockScreensaver)
+    const bool blockScreensaver = frame->flags & FRAME_FLAG_BLOCK_SCREENSAVER;
+    if (g_params.autoScreensaver && g_state.autoIdleInhibitState != blockScreensaver)
     {
-      if (frame->blockScreensaver)
+      if (blockScreensaver)
         g_state.ds->inhibitIdle();
       else
         g_state.ds->uninhibitIdle();
-      g_state.autoIdleInhibitState = frame->blockScreensaver;
+      g_state.autoIdleInhibitState = blockScreensaver;
     }
 
     const uint64_t t      = nanotime();
diff --git a/common/include/common/KVMFR.h b/common/include/common/KVMFR.h
index 7564720e..33b40982 100644
--- a/common/include/common/KVMFR.h
+++ b/common/include/common/KVMFR.h
@@ -28,7 +28,7 @@
 #include "types.h"
 
 #define KVMFR_MAGIC   "KVMFR---"
-#define KVMFR_VERSION 17
+#define KVMFR_VERSION 18
 
 #define KVMFR_MAX_DAMAGE_RECTS 64
 
@@ -124,6 +124,14 @@ typedef struct KVMFRCursor
 }
 KVMFRCursor;
 
+enum
+{
+  FRAME_FLAG_BLOCK_SCREENSAVER  = 0x1,
+  FRAME_FLAG_REQUEST_ACTIVATION = 0x2
+};
+
+typedef uint32_t KVMFRFrameFlags;
+
 typedef struct KVMFRFrame
 {
   uint32_t        formatVer;          // the frame format version number
@@ -138,8 +146,7 @@ typedef struct KVMFRFrame
   uint32_t        offset;             // offset from the start of this header to the FrameBuffer header
   uint32_t        damageRectsCount;   // the number of damage rectangles (zero for full-frame damage)
   FrameDamageRect damageRects[KVMFR_MAX_DAMAGE_RECTS];
-  bool            blockScreensaver;   // whether the guest has requested to block screensavers
-  bool            requestActivation;  // whether the guest has requested activation since the last frame
+  KVMFRFrameFlags flags;              // bit field combination of FRAME_FLAG_*
 }
 KVMFRFrame;
 
diff --git a/host/src/app.c b/host/src/app.c
index 4acabedd..7736fdac 100644
--- a/host/src/app.c
+++ b/host/src/app.c
@@ -275,8 +275,11 @@ static bool sendFrame(void)
   fi->stride            = frame.stride;
   fi->pitch             = frame.pitch;
   fi->offset            = app.pageSize - FrameBufferStructSize;
-  fi->blockScreensaver  = os_blockScreensaver();
-  fi->requestActivation = os_getAndClearPendingActivationRequest();
+  fi->flags             =
+    (os_blockScreensaver() ?
+     FRAME_FLAG_BLOCK_SCREENSAVER : 0) |
+    (os_getAndClearPendingActivationRequest() ?
+     FRAME_FLAG_REQUEST_ACTIVATION : 0);
   app.frameValid        = true;
 
   fi->damageRectsCount  = frame.damageRectsCount;