diff --git a/lib/wibox/layout/flex.lua b/lib/wibox/layout/flex.lua
index 6dc240bab..c09daa50d 100644
--- a/lib/wibox/layout/flex.lua
+++ b/lib/wibox/layout/flex.lua
@@ -10,7 +10,6 @@ local base = require("wibox.widget.base")
 local fixed = require("wibox.layout.fixed")
 local table = table
 local pairs = pairs
-local floor = math.floor
 local gmath = require("gears.math")
 local gtable = require("gears.table")
 
@@ -68,7 +67,7 @@ local flex = {}
 
 function flex:layout(_, width, height)
     local result = {}
-    local pos,spacing = 0, self._private.spacing
+    local spacing = self._private.spacing
     local num = #self._private.widgets
     local total_spacing = (spacing*(num-1))
     local spacing_widget = self._private.spacing_widget
@@ -88,17 +87,23 @@ function flex:layout(_, width, height)
         space_per_item = math.min(space_per_item, self._private.max_widget_size)
     end
 
+    local pos, pos_rounded = 0, 0
     for k, v in pairs(self._private.widgets) do
         local x, y, w, h
+
+        local next_pos = pos + space_per_item
+        local next_pos_rounded = gmath.round(next_pos)
+
         if is_y then
-            x, y = 0, gmath.round(pos)
-            w, h = width, floor(space_per_item)
+            x, y = 0, pos_rounded
+            w, h = width, next_pos_rounded - pos_rounded
         else
-            x, y = gmath.round(pos), 0
-            w, h = floor(space_per_item), height
+            x, y = pos_rounded, 0
+            w, h = next_pos_rounded - pos_rounded, height
         end
 
-        pos = pos + space_per_item + spacing
+        pos = next_pos + spacing
+        pos_rounded = next_pos_rounded + spacing
 
         table.insert(result, base.place_widget_at(v, x, y, w, h))
 
diff --git a/spec/wibox/layout/flex_spec.lua b/spec/wibox/layout/flex_spec.lua
index 9ed9ae37b..e842d2a90 100644
--- a/spec/wibox/layout/flex_spec.lua
+++ b/spec/wibox/layout/flex_spec.lua
@@ -47,7 +47,7 @@ describe("wibox.layout.flex", function()
             it("layout", function()
                 assert.widget_layout(layout, { 100, 100 }, {
                     p(first,  0,  0, 100, 33),
-                    p(second, 0, 33, 100, 33),
+                    p(second, 0, 33, 100, 34),
                     p(third,  0, 67, 100, 33),
                 })
             end)
@@ -61,7 +61,7 @@ describe("wibox.layout.flex", function()
             it("layout", function()
                 assert.widget_layout(layout, { 5, 100 }, {
                     p(first,  0,  0, 5, 33),
-                    p(second, 0, 33, 5, 33),
+                    p(second, 0, 33, 5, 34),
                     p(third,  0, 67, 5, 33),
                 })
             end)
@@ -74,9 +74,9 @@ describe("wibox.layout.flex", function()
 
             it("layout", function()
                 assert.widget_layout(layout, { 100, 20 }, {
-                    p(first,  0,  0, 100, 6),
+                    p(first,  0,  0, 100, 7),
                     p(second, 0,  7, 100, 6),
-                    p(third,  0, 13, 100, 6),
+                    p(third,  0, 13, 100, 7),
                 })
             end)
         end)