diff --git a/src/movesize.cc b/src/movesize.cc
index 54eab4d25..2038504af 100644
--- a/src/movesize.cc
+++ b/src/movesize.cc
@@ -830,9 +830,11 @@ bool YFrameWindow::canSize(bool horiz, bool vert) {
     return true;
 }
 
-void YFrameWindow::startMoveSize(int x, int y,
-                                 int direction)
+void YFrameWindow::netMoveSize(int x, int y, int direction)
 {
+    if (movingWindow || sizingWindow)
+        return;
+
     int sx[] = { -1, 0, 1, 1, 1, 0, -1, -1, };
     int sy[] = { -1, -1, -1, 0, 1, 1, 1, 0, };
 
diff --git a/src/wmclient.cc b/src/wmclient.cc
index 863cec82e..327513c75 100644
--- a/src/wmclient.cc
+++ b/src/wmclient.cc
@@ -955,8 +955,8 @@ void YFrameClient::handleClientMessage(const XClientMessageEvent &message) {
                message.format == 32)
     {
         if (getFrame())
-            getFrame()->startMoveSize(message.data.l[0], message.data.l[1],
-                                      message.data.l[2]);
+            getFrame()->netMoveSize(message.data.l[0], message.data.l[1],
+                                    message.data.l[2]);
     } else if (message.message_type == _XA_NET_MOVERESIZE_WINDOW) {
         if (getFrame()) {
             long flag = message.data.l[0];
diff --git a/src/wmframe.h b/src/wmframe.h
index b1e442e3c..41cd29912 100644
--- a/src/wmframe.h
+++ b/src/wmframe.h
@@ -126,7 +126,7 @@ class YFrameWindow:
     YFrameTitleBar *titlebar();
     YClientContainer *container() const { return fContainer; }
 
-    void startMoveSize(int x, int y, int direction);
+    void netMoveSize(int x, int y, int direction);
 
     void startMoveSize(bool doMove, bool byMouse,
                        int sideX, int sideY,