diff --git a/indra/llwindow/llwindow.cpp b/indra/llwindow/llwindow.cpp
index 066d29c624d..7933a7b4c82 100644
--- a/indra/llwindow/llwindow.cpp
+++ b/indra/llwindow/llwindow.cpp
@@ -104,7 +104,6 @@ LLWindow::LLWindow(LLWindowCallbacks* callbacks, bool fullscreen, U32 flags)
       mFullscreen(fullscreen),
       mFullscreenWidth(0),
       mFullscreenHeight(0),
-      mFullscreenBits(0),
       mFullscreenRefresh(0),
       mSupportedResolutions(NULL),
       mNumSupportedResolutions(0),
diff --git a/indra/llwindow/llwindow.h b/indra/llwindow/llwindow.h
index 24debf339d5..d6f98df5794 100644
--- a/indra/llwindow/llwindow.h
+++ b/indra/llwindow/llwindow.h
@@ -226,7 +226,6 @@ class LLWindow : public LLInstanceTracker<LLWindow>
     bool        mFullscreen;
     S32         mFullscreenWidth;
     S32         mFullscreenHeight;
-    S32         mFullscreenBits;
     S32         mFullscreenRefresh;
     LLWindowResolution* mSupportedResolutions;
     S32         mNumSupportedResolutions;
diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 69d33c74a8d..2c5da469acf 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -690,8 +690,7 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
             }
 
             if (dev_mode.dmPelsWidth == width &&
-                dev_mode.dmPelsHeight == height &&
-                dev_mode.dmBitsPerPel == BITS_PER_PIXEL)
+                dev_mode.dmPelsHeight == height)
             {
                 success = true;
                 if ((dev_mode.dmDisplayFrequency - current_refresh)
@@ -731,7 +730,7 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
         // If we found a good resolution, use it.
         if (success)
         {
-            success = setDisplayResolution(width, height, BITS_PER_PIXEL, closest_refresh);
+            success = setDisplayResolution(width, height, closest_refresh);
         }
 
         // Keep a copy of the actual current device mode in case we minimize
@@ -744,7 +743,6 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
             mFullscreen = true;
             mFullscreenWidth   = dev_mode.dmPelsWidth;
             mFullscreenHeight  = dev_mode.dmPelsHeight;
-            mFullscreenBits    = dev_mode.dmBitsPerPel;
             mFullscreenRefresh = dev_mode.dmDisplayFrequency;
 
             LL_INFOS("Window") << "Running at " << dev_mode.dmPelsWidth
@@ -758,7 +756,6 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
             mFullscreen = false;
             mFullscreenWidth   = -1;
             mFullscreenHeight  = -1;
-            mFullscreenBits    = -1;
             mFullscreenRefresh = -1;
 
             std::map<std::string,std::string> args;
@@ -1175,7 +1172,7 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
         // If we found a good resolution, use it.
         if (success)
         {
-            success = setDisplayResolution(width, height, BITS_PER_PIXEL, closest_refresh);
+            success = setDisplayResolution(width, height, closest_refresh);
         }
 
         // Keep a copy of the actual current device mode in case we minimize
@@ -1187,7 +1184,6 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
             mFullscreen = true;
             mFullscreenWidth = dev_mode.dmPelsWidth;
             mFullscreenHeight = dev_mode.dmPelsHeight;
-            mFullscreenBits = dev_mode.dmBitsPerPel;
             mFullscreenRefresh = dev_mode.dmDisplayFrequency;
 
             LL_INFOS("Window") << "Running at " << dev_mode.dmPelsWidth
@@ -1213,7 +1209,6 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
             mFullscreen = false;
             mFullscreenWidth = -1;
             mFullscreenHeight = -1;
-            mFullscreenBits = -1;
             mFullscreenRefresh = -1;
 
             LL_INFOS("Window") << "Unable to run fullscreen at " << width << "x" << height << LL_ENDL;
@@ -3509,7 +3504,7 @@ F32 LLWindowWin32::getPixelAspectRatio()
 
 // Change display resolution.  Returns true if successful.
 // protected
-bool LLWindowWin32::setDisplayResolution(S32 width, S32 height, S32 bits, S32 refresh)
+bool LLWindowWin32::setDisplayResolution(S32 width, S32 height, S32 refresh)
 {
     DEVMODE dev_mode;
     ::ZeroMemory(&dev_mode, sizeof(DEVMODE));
@@ -3521,7 +3516,6 @@ bool LLWindowWin32::setDisplayResolution(S32 width, S32 height, S32 bits, S32 re
     {
         if (dev_mode.dmPelsWidth        == width &&
             dev_mode.dmPelsHeight       == height &&
-            dev_mode.dmBitsPerPel       == bits &&
             dev_mode.dmDisplayFrequency == refresh )
         {
             // ...display mode identical, do nothing
@@ -3533,9 +3527,8 @@ bool LLWindowWin32::setDisplayResolution(S32 width, S32 height, S32 bits, S32 re
     dev_mode.dmSize = sizeof(dev_mode);
     dev_mode.dmPelsWidth        = width;
     dev_mode.dmPelsHeight       = height;
-    dev_mode.dmBitsPerPel       = bits;
     dev_mode.dmDisplayFrequency = refresh;
-    dev_mode.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY;
+    dev_mode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY;
 
     // CDS_FULLSCREEN indicates that this is a temporary change to the device mode.
     LONG cds_result = ChangeDisplaySettings(&dev_mode, CDS_FULLSCREEN);
@@ -3545,7 +3538,7 @@ bool LLWindowWin32::setDisplayResolution(S32 width, S32 height, S32 bits, S32 re
     if (!success)
     {
         LL_WARNS("Window") << "setDisplayResolution failed, "
-            << width << "x" << height << "x" << bits << " @ " << refresh << LL_ENDL;
+            << width << "x" << height << " @ " << refresh << LL_ENDL;
     }
 
     return success;
@@ -3556,7 +3549,7 @@ bool LLWindowWin32::setFullscreenResolution()
 {
     if (mFullscreen)
     {
-        return setDisplayResolution( mFullscreenWidth, mFullscreenHeight, mFullscreenBits, mFullscreenRefresh);
+        return setDisplayResolution( mFullscreenWidth, mFullscreenHeight, mFullscreenRefresh);
     }
     else
     {
diff --git a/indra/llwindow/llwindowwin32.h b/indra/llwindow/llwindowwin32.h
index 3040658520f..39aa8366949 100644
--- a/indra/llwindow/llwindowwin32.h
+++ b/indra/llwindow/llwindowwin32.h
@@ -151,7 +151,7 @@ class LLWindowWin32 : public LLWindow
     LLSD    getNativeKeyData() const override;
 
     // Changes display resolution. Returns true if successful
-    bool    setDisplayResolution(S32 width, S32 height, S32 bits, S32 refresh);
+    bool    setDisplayResolution(S32 width, S32 height, S32 refresh);
 
     // Go back to last fullscreen display resolution.
     bool    setFullscreenResolution();