diff --git a/Rules/Languages/de/definitions.yaml b/Rules/Languages/de/definitions.yaml
index bb54a3c82..73dfcf7f7 100644
--- a/Rules/Languages/de/definitions.yaml
+++ b/Rules/Languages/de/definitions.yaml
@@ -96,7 +96,7 @@
     "pc": "parsec", "Å": "ångström", "Å": "ångström", "fm": "fermi",
     "ha": "hektar", "dB": "dezibel", "amu": "atommasse-einheit", "atm": "atmosphäre",
     "bar": "bar", "cal": "kalorie", "Ci": "curie", "grad": "gon", "M": "mol/liter",
-    "R": "röntgen", "rpm": "umdrehungen pro minute", "℧": "mho", "dyn": "dyn", "erg": "erg",
+    "R": "röntgen", "rpm": "Umdrehung pro Minute", "℧": "mho", "dyn": "dyn", "erg": "erg",
     "Kib": "kibi-bit", "Mib": "mebi-bit", "Gib": "gibi-bit", "Tib": "tebi-bit", "Pib": "pebi-bit",
     "Eib": "exbi-bit", "Zib": "zebi-bit", "Yib": "yobi-bit", "KiB": "kibi-byte", "MiB": "mebi-byte",
     "GiB": "gibi-byte", "TiB": "tebi-byte", "PiB": "pebi-byte", "EiB": "exbi-byte",
@@ -204,7 +204,7 @@
     "kibi-byte": "kibi-byte", "mebi-byte": "mebi-byte", "gibi-byte": "gibi-byte",
     "tebi-byte": "tebi-byte", "pebi-byte": "pebi-byte", "exbi-byte": "exbi-byte",
     "zebi-byte": "zebi-byte", "yobi-byte": "yobi-byte",
-    "umdrehungen pro minute": "umdrehungen pro minute"
+    "Umdrehung pro Minute": "Umdrehungen pro Minute"
   }
 
 
diff --git a/tests/Languages/de/units.rs b/tests/Languages/de/units.rs
index 605ac2ed1..06de867e2 100644
--- a/tests/Languages/de/units.rs
+++ b/tests/Languages/de/units.rs
@@ -120,6 +120,24 @@ fn currency_symbol_precedes_amount() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn rpm_uses_singular_and_plural_forms() -> Result<()> {
+    // The unit name is singular only for a coefficient of exactly one.
+    test(
+        "de",
+        "SimpleSpeak",
+        r#"<math><mn>1</mn><mi intent=":unit">rpm</mi></math>"#,
+        "1 Umdrehung pro Minute",
+    )?;
+    test(
+        "de",
+        "SimpleSpeak",
+        r#"<math><mn>2</mn><mi intent=":unit">rpm</mi></math>"#,
+        "2 Umdrehungen pro Minute",
+    )?;
+    Ok(())
+}
+
 /*
 #[test]
 fn si_base_with_prefixes() -> Result<()> {