diff --git a/Rules/Languages/de/definitions.yaml b/Rules/Languages/de/definitions.yaml
index de78c7530..163c3f86d 100644
--- a/Rules/Languages/de/definitions.yaml
+++ b/Rules/Languages/de/definitions.yaml
@@ -29,6 +29,7 @@
     "plus": "infix=plus || prefix=positiv",
     "real-part": "function=der reale teil",
     "transpose": "postfix=transponieren || function=transponieren",
+    "magnitude": "function=; Norm: Norm: Norm; Ende Norm",
     "norm": "function=; norm: norm: norm; ende norm",
     "trace": "function=; spur : spur: die spur; ende spur",
     "dimension": "function=; dimension : dimension: die dimension; ende dimension",
diff --git a/tests/Languages/de/intent.rs b/tests/Languages/de/intent.rs
index 62e711db6..d31af9d9b 100644
--- a/tests/Languages/de/intent.rs
+++ b/tests/Languages/de/intent.rs
@@ -3,6 +3,15 @@
 use crate::common::*;
 use anyhow::Result;
 
+#[test]
+fn magnitude_is_localized_as_norm() -> Result<()> {
+    // Double bars infer the magnitude intent, which should use the German term "Norm".
+    let expr = "<math><mo>‖</mo><mi>x</mi><mo>‖</mo></math>";
+    test("de", "ClearSpeak", expr, "Norm von x")?;
+    test("de", "SimpleSpeak", expr, "Norm von x")?;
+    Ok(())
+}
+
 #[test]
 fn clear_speak_short_pause_intent() -> Result<()> {
     // A short pause intent should survive intent inference and render as a comma.