diff --git a/src/vaadin-grid.html b/src/vaadin-grid.html
index 5532552ec..0ba24b36b 100644
--- a/src/vaadin-grid.html
+++ b/src/vaadin-grid.html
@@ -774,6 +774,17 @@
             this.$.items.style.paddingBottom = `${this.$.footer.offsetHeight}px`;
           }
         }
+
+        if (this._ios) {
+          const isOldIOS = !window.CSS.supports('position', 'sticky');
+          if (isOldIOS) {
+            // Due to a rendering bug, the sticky header may disappear on an older iOS (10-12) Safari
+            // if the grid is used inside of a flex box. This is a workaround for the issue.
+            this.$.table.style.height = `${this.$.scroller.offsetHeight}px`;
+            this.$.table.style.minHeight = '100%';
+            this.$.table.style.maxHeight = '100%';
+          }
+        }
       }
 
       /**