diff --git a/docx-core/src/reader/attributes/width.rs b/docx-core/src/reader/attributes/width.rs
index f65932a..4ab9c09 100644
--- a/docx-core/src/reader/attributes/width.rs
+++ b/docx-core/src/reader/attributes/width.rs
@@ -14,7 +14,7 @@ pub fn read_width(attrs: &[OwnedAttribute]) -> Result<(isize, WidthType), Reader
         if local_name == "type" {
             width_type = WidthType::from_str(&a.value)?;
         } else if local_name == "w" {
-            w = isize::from_str(&a.value)?;
+            w = f64::from_str(&a.value).expect("should read width.") as isize;
         }
     }
     Ok((w, width_type))