diff --git a/common/include/common/KVMFR.h b/common/include/common/KVMFR.h
index 1981202a..4b1fd34d 100644
--- a/common/include/common/KVMFR.h
+++ b/common/include/common/KVMFR.h
@@ -23,10 +23,11 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #pragma once
 
 #include <stdint.h>
+#include <stdbool.h>
 #include "types.h"
 
 #define KVMFR_MAGIC   "KVMFR---"
-#define KVMFR_VERSION 8
+#define KVMFR_VERSION 9
 
 #define LGMP_Q_POINTER     1
 #define LGMP_Q_FRAME       2
@@ -73,6 +74,7 @@ typedef struct KVMFRFrame
   uint32_t      pitch;             // the row pitch  (stride in bytes or the compressed frame size)
   uint32_t      offset;            // offset from the start of this header to the FrameBuffer header
   uint32_t      mouseScalePercent; // movement scale factor of the mouse (relates to DPI of display, 100 = no scale)
+  bool          blockScreensaver;  // whether the guest has requested to block screensavers
 }
 KVMFRFrame;
 
diff --git a/host/include/interface/platform.h b/host/include/interface/platform.h
index 00dd1279..4331ab44 100644
--- a/host/include/interface/platform.h
+++ b/host/include/interface/platform.h
@@ -38,3 +38,5 @@ void app_quit();
 // these must be implemented for each OS
 const char * os_getExecutable();
 const char * os_getDataPath();
+
+bool os_blockScreensaver();
diff --git a/host/platform/Linux/src/platform.c b/host/platform/Linux/src/platform.c
index 933171b4..0316339e 100644
--- a/host/platform/Linux/src/platform.c
+++ b/host/platform/Linux/src/platform.c
@@ -72,3 +72,8 @@ const char * os_getDataPath(void)
 {
   return app.dataPath;
 }
+
+bool os_blockScreensaver()
+{
+  return false;
+}
diff --git a/host/platform/Windows/CMakeLists.txt b/host/platform/Windows/CMakeLists.txt
index 18fe746e..71bcfa3d 100644
--- a/host/platform/Windows/CMakeLists.txt
+++ b/host/platform/Windows/CMakeLists.txt
@@ -33,6 +33,7 @@ target_link_libraries(platform_Windows
 	wtsapi32
 	psapi
 	shlwapi
+	powrprof
 )
 
 target_include_directories(platform_Windows
diff --git a/host/platform/Windows/src/platform.c b/host/platform/Windows/src/platform.c
index 3ed3c74c..e7bf0a0d 100644
--- a/host/platform/Windows/src/platform.c
+++ b/host/platform/Windows/src/platform.c
@@ -25,6 +25,8 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <shellapi.h>
 #include <shlwapi.h>
 #include <fcntl.h>
+#include <powrprof.h>
+#include <ntstatus.h>
 
 #include "interface/platform.h"
 #include "common/debug.h"
@@ -397,3 +399,24 @@ HWND os_getMessageWnd(void)
 {
   return app.messageWnd;
 }
+
+bool os_blockScreensaver()
+{
+  static bool      lastResult = false;
+  static ULONGLONG lastCheck  = 0;
+
+  ULONGLONG now = GetTickCount64();
+  if (now - lastCheck >= 1000)
+  {
+    ULONG executionState;
+    NTSTATUS status = CallNtPowerInformation(SystemExecutionState, NULL, 0,
+      &executionState, sizeof executionState);
+
+    if (status == STATUS_SUCCESS)
+      lastResult = executionState & ES_DISPLAY_REQUIRED;
+    else
+      DEBUG_ERROR("Failed to call CallNtPowerInformation(SystemExecutionState): %ld", status);
+    lastCheck = now;
+  }
+  return lastResult;
+}
diff --git a/host/src/app.c b/host/src/app.c
index 466b94fa..b38d1dab 100644
--- a/host/src/app.c
+++ b/host/src/app.c
@@ -206,6 +206,7 @@ static int frameThread(void * opaque)
     fi->pitch             = frame.pitch;
     fi->offset            = pageSize - FrameBufferStructSize;
     fi->mouseScalePercent = app.iface->getMouseScale();
+    fi->blockScreensaver  = os_blockScreensaver();
     frameValid            = true;
 
     // put the framebuffer on the border of the next page