diff --git a/src/backends/meta-monitor-config-manager.c b/src/backends/meta-monitor-config-manager.c
index 5ff4fd0fe..81abb65f3 100644
--- a/src/backends/meta-monitor-config-manager.c
+++ b/src/backends/meta-monitor-config-manager.c
@@ -981,8 +981,10 @@ meta_verify_logical_monitor_config (MetaLogicalMonitorConfig    *logical_monitor
   switch (layout_mode)
     {
     case META_LOGICAL_MONITOR_LAYOUT_MODE_LOGICAL:
-      expected_mode_width *= logical_monitor_config->scale;
-      expected_mode_height *= logical_monitor_config->scale;
+      expected_mode_width = roundf (expected_mode_width *
+                                    logical_monitor_config->scale);
+      expected_mode_height = roundf (expected_mode_height *
+                                     logical_monitor_config->scale);
       break;
     case META_LOGICAL_MONITOR_LAYOUT_MODE_PHYSICAL:
       break;
diff --git a/src/backends/meta-monitor-config-store.c b/src/backends/meta-monitor-config-store.c
index aa0310b0b..6ed19432a 100644
--- a/src/backends/meta-monitor-config-store.c
+++ b/src/backends/meta-monitor-config-store.c
@@ -453,8 +453,8 @@ derive_logical_monitor_layout (MetaLogicalMonitorConfig    *logical_monitor_conf
   switch (layout_mode)
     {
     case META_LOGICAL_MONITOR_LAYOUT_MODE_LOGICAL:
-      width /= logical_monitor_config->scale;
-      height /= logical_monitor_config->scale;
+      width = roundf (width / logical_monitor_config->scale);
+      height = roundf (height / logical_monitor_config->scale);
       break;
     case META_LOGICAL_MONITOR_LAYOUT_MODE_PHYSICAL:
       break;
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index aed46049e..099a48e74 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -1968,8 +1968,8 @@ derive_logical_monitor_size (MetaMonitorConfig           *monitor_config,
   switch (layout_mode)
     {
     case META_LOGICAL_MONITOR_LAYOUT_MODE_LOGICAL:
-      width /= scale;
-      height /= scale;
+      width = roundf (width / scale);
+      height = roundf (height / scale);
       break;
     case META_LOGICAL_MONITOR_LAYOUT_MODE_PHYSICAL:
       break;