diff --git a/core/misc/tableheader.js b/core/misc/tableheader.js
index 2c7624023ca986bc1de8db1d3b41a5a4d33f26cf..f649a767a3983576dec20b86f0dd90e4afc8c7dc 100644
--- a/core/misc/tableheader.js
+++ b/core/misc/tableheader.js
@@ -325,7 +325,7 @@
             $stickyCell[0].style.display = 'none';
           }
         }
-        this.$stickyTable[0].style.width = this.$originalTable.outerWidth();
+        this.$stickyTable[0].style.width = `${this.$originalTable.outerWidth()}px`;
       },
     },
   );