diff --git a/xorg/X11R7.6/rdp/rdp.h b/xorg/X11R7.6/rdp/rdp.h
index 22dcdbf7..b9c02353 100644
--- a/xorg/X11R7.6/rdp/rdp.h
+++ b/xorg/X11R7.6/rdp/rdp.h
@@ -114,7 +114,9 @@ struct _rdpScreenInfoRec
   int height;
   int depth;
   int bitsPerPixel;
-  int sizeInBytes;
+  int sizeInBytes; /* size of current used frame buffer */
+  int sizeInBytesAlloc; /* size of current alloc frame buffer,
+                           always >= sizeInBytes */
   char* pfbMemory;
   Pixel blackPixel;
   Pixel whitePixel;
diff --git a/xorg/X11R7.6/rdp/rdpmain.c b/xorg/X11R7.6/rdp/rdpmain.c
index b2cbf771..f81b4f70 100644
--- a/xorg/X11R7.6/rdp/rdpmain.c
+++ b/xorg/X11R7.6/rdp/rdpmain.c
@@ -272,6 +272,7 @@ rdpScreenInit(int index, ScreenPtr pScreen, int argc, char **argv)
             (g_rdpScreen.paddedWidthInBytes * g_rdpScreen.height);
         ErrorF("buffer size %d\n", g_rdpScreen.sizeInBytes);
         g_rdpScreen.pfbMemory = (char *)g_malloc(g_rdpScreen.sizeInBytes, 1);
+        g_rdpScreen.sizeInBytesAlloc = g_rdpScreen.sizeInBytes;
     }
 
     if (g_rdpScreen.pfbMemory == 0)
diff --git a/xorg/X11R7.6/rdp/rdprandr.c b/xorg/X11R7.6/rdp/rdprandr.c
index 26b56bfe..8b3eb582 100644
--- a/xorg/X11R7.6/rdp/rdprandr.c
+++ b/xorg/X11R7.6/rdp/rdprandr.c
@@ -156,8 +156,13 @@ rdpRRScreenSetSize(ScreenPtr pScreen, CARD16 width, CARD16 height,
         ErrorF("  resizing screenPixmap [%p] to %dx%d, currently at %dx%d\n",
                (void *)screenPixmap, width, height,
                screenPixmap->drawable.width, screenPixmap->drawable.height);
-        g_free(g_rdpScreen.pfbMemory);
-        g_rdpScreen.pfbMemory = g_malloc(g_rdpScreen.sizeInBytes, 1);
+        if (g_rdpScreen.sizeInBytes > g_rdpScreen.sizeInBytesAlloc)
+        {
+            g_free(g_rdpScreen.pfbMemory);
+            g_rdpScreen.pfbMemory = (char*)g_malloc(g_rdpScreen.sizeInBytes, 1);
+            g_rdpScreen.sizeInBytesAlloc = g_rdpScreen.sizeInBytes;
+            ErrorF("new buffer size %d\n", g_rdpScreen.sizeInBytes);
+        }
         pScreen->ModifyPixmapHeader(screenPixmap, width, height,
                                     g_rdpScreen.depth, g_rdpScreen.bitsPerPixel,
                                     g_rdpScreen.paddedWidthInBytes,