diff --git a/src/container.zig b/src/container.zig
index a704995..f769767 100644
--- a/src/container.zig
+++ b/src/container.zig
@@ -727,7 +727,7 @@ pub fn Container(Model: type, Event: type) type {
             // assign currently calculated size
             this.size = switch (this.properties.size.grow) {
                 .both => .max(size, this.properties.size.dim),
-                .fixed => this.properties.size.dim,
+                .fixed => if (this.properties.size.dim.x != 0 and this.properties.size.dim.y != 0) this.properties.size.dim else size,
                 .horizontal => .{
                     .x = @max(size.x, this.properties.size.dim.x),
                     .y = this.properties.size.dim.y,