diff --git a/icu4c/source/i18n/unicode/measunit.h b/icu4c/source/i18n/unicode/measunit.h
index f0abd4f4f92..5277cca5f14 100644
--- a/icu4c/source/i18n/unicode/measunit.h
+++ b/icu4c/source/i18n/unicode/measunit.h
@@ -2847,29 +2847,25 @@ class U_I18N_API MeasureUnit: public UObject {
      */
     static MeasureUnit getTonne();
 
+#ifndef U_HIDE_DEPRECATED_API
     /**
      * Returns by pointer, unit of mass: metric-ton
      * (renamed to tonne in CLDR 42 / ICU 72).
      * Caller owns returned value and must free it.
-     * Note: In ICU 74 this will be deprecated in favor of
-     * createTonne(), which is currently draft but will
-     * become stable in ICU 74, and which uses the preferred naming.
      * Also see {@link #getMetricTon()} and {@link #createTonne()}.
      * @param status ICU error code.
-     * @stable ICU 54
+     * @deprecated ICU 78 use createTonne(UErrorCode &status)
      */
     static MeasureUnit *createMetricTon(UErrorCode &status);
 
     /**
      * Returns by value, unit of mass: metric-ton
      * (renamed to tonne in CLDR 42 / ICU 72).
-     * Note: In ICU 74 this will be deprecated in favor of
-     * getTonne(), which is currently draft but will
-     * become stable in ICU 74, and which uses the preferred naming.
      * Also see {@link #createMetricTon()} and {@link #getTonne()}.
-     * @stable ICU 64
+     * @deprecated ICU 78 use getTonne()
      */
     static MeasureUnit getMetricTon();
+#endif  /* U_HIDE_DEPRECATED_API */
 
     /**
      * Returns by pointer, unit of power: gigawatt.
diff --git a/icu4j/main/core/src/main/java/com/ibm/icu/util/MeasureUnit.java b/icu4j/main/core/src/main/java/com/ibm/icu/util/MeasureUnit.java
index 16cd2842e01..286502895c2 100644
--- a/icu4j/main/core/src/main/java/com/ibm/icu/util/MeasureUnit.java
+++ b/icu4j/main/core/src/main/java/com/ibm/icu/util/MeasureUnit.java
@@ -1776,10 +1776,10 @@ public class MeasureUnit implements Serializable {
 
     /**
      * Constant for unit of mass: metric-ton (renamed to tonne in CLDR 42 / ICU 72).
-     * Note: In ICU 74 this will be deprecated in favor of TONNE, which is currently
-     * draft but will become stable in ICU 74, and which uses the preferred naming.
-     * @stable ICU 54
+     * @internal
+     * @deprecated This API is ICU internal only.
      */
+    @Deprecated
     public static final MeasureUnit METRIC_TON = MeasureUnit.internalGetInstance("mass", "tonne");
 
     /**