diff --git a/unix/common/randr.cxx b/unix/common/randr.cxx
index 44e46de..08bd45e 100644
--- a/unix/common/randr.cxx
+++ b/unix/common/randr.cxx
@@ -113,7 +113,7 @@
                layout.num_screens() - availableOutputs);
     ret = vncRandRCreateOutputs(screenIndex,
                                 layout.num_screens() - availableOutputs);
-    if (ret < 0) {
+    if (!ret) {
       vlog.error("Unable to create more screens, as needed by the new client layout.");
       return rfb::resultInvalid;
     }
diff --git a/unix/xserver/hw/vnc/RandrGlue.c b/unix/xserver/hw/vnc/RandrGlue.c
index 9f770fa..8106571 100644
--- a/unix/xserver/hw/vnc/RandrGlue.c
+++ b/unix/xserver/hw/vnc/RandrGlue.c
@@ -50,7 +50,7 @@
                          pScreen->mmWidth * width / pScreen->width,
                          pScreen->mmHeight * height / pScreen->height);
 #else
-  return -1;
+  return 0;
 #endif
 }
 
@@ -199,11 +199,11 @@
 
   crtc = rp->outputs[outputIdx]->crtc;
   if (crtc == NULL)
-    return 0;
+    return 1;
 
   return RRCrtcSet(crtc, NULL, crtc->x, crtc->y, crtc->rotation, 0, NULL);
 #else
-  return -1;
+  return 0;
 #endif
 }
 
@@ -267,17 +267,17 @@
 
     /* Couldn't find one... */
     if (crtc == NULL)
-      return -1;
+      return 0;
   }
 
   /* Make sure we have the mode we want */
   mode = vncRandRCreatePreferredMode(output, width, height);
   if (mode == NULL)
-    return -1;
+    return 0;
 
   /* Reconfigure new mode and position */
   return RRCrtcSet(crtc, mode, x, y, crtc->rotation, 1, &output);
 #else
-  return -1;
+  return 0;
 #endif
 }
diff --git a/unix/xserver/hw/vnc/vncModule.c b/unix/xserver/hw/vnc/vncModule.c
index 3fb0776..704e56e 100644
--- a/unix/xserver/hw/vnc/vncModule.c
+++ b/unix/xserver/hw/vnc/vncModule.c
@@ -115,7 +115,7 @@
 #ifdef RANDR
 int vncRandRCreateOutputs(int scrIdx, int extraOutputs)
 {
-  return -1;
+  return 0;
 }
 
 void *vncRandRCreatePreferredMode(void *out, int width, int height)
diff --git a/unix/xserver/hw/vnc/xvnc.c b/unix/xserver/hw/vnc/xvnc.c
index 56a6ca5..4133689 100644
--- a/unix/xserver/hw/vnc/xvnc.c
+++ b/unix/xserver/hw/vnc/xvnc.c
@@ -1387,11 +1387,11 @@
     while (extraOutputs > 0) {
         crtc = vncRandRCrtcCreate(screenInfo.screens[scrIdx]);
         if (crtc == NULL)
-            return -1;
+            return 0;
         extraOutputs--;
     }
 
-    return 0;
+    return 1;
 }
 
 /* Used to create a preferred mode from various places */