diff --git a/icu4c/source/common/digitlst.cpp b/icu4c/source/common/digitlst.cpp
index 6b5588dd20..c61ac839cd 100644
--- a/icu4c/source/common/digitlst.cpp
+++ b/icu4c/source/common/digitlst.cpp
@@ -531,6 +531,7 @@ DigitList::isZero() const
  * We represent LONG_MIN internally as LONG_MAX + 1.  This is actually an impossible
  * value, for positive long integers, so we are safe in doing so.
  */
+/* // This code is unused.
 UBool
 DigitList::isLONG_MIN() const
 {
@@ -547,6 +548,7 @@ DigitList::isLONG_MIN() const
 
     return TRUE;
 }
+*/
 
 // Initialize the LONG_MIN representation buffer.  Note that LONG_MIN
 // is stored as LONG_MAX+1 (LONG_MIN without the negative sign).
diff --git a/icu4c/source/common/digitlst.h b/icu4c/source/common/digitlst.h
index bc025e2ee3..1dec44b493 100644
--- a/icu4c/source/common/digitlst.h
+++ b/icu4c/source/common/digitlst.h
@@ -137,7 +137,8 @@ public:
      * this method to determine if this is so; you cannot check directly,
      * because a special format is used to handle this.
      */
-    UBool isLONG_MIN(void) const;
+    // This code is unused.
+    //UBool isLONG_MIN(void) const;
 
 public:
     /**
diff --git a/icu4c/source/i18n/digitlst.cpp b/icu4c/source/i18n/digitlst.cpp
index 6b5588dd20..c61ac839cd 100644
--- a/icu4c/source/i18n/digitlst.cpp
+++ b/icu4c/source/i18n/digitlst.cpp
@@ -531,6 +531,7 @@ DigitList::isZero() const
  * We represent LONG_MIN internally as LONG_MAX + 1.  This is actually an impossible
  * value, for positive long integers, so we are safe in doing so.
  */
+/* // This code is unused.
 UBool
 DigitList::isLONG_MIN() const
 {
@@ -547,6 +548,7 @@ DigitList::isLONG_MIN() const
 
     return TRUE;
 }
+*/
 
 // Initialize the LONG_MIN representation buffer.  Note that LONG_MIN
 // is stored as LONG_MAX+1 (LONG_MIN without the negative sign).
diff --git a/icu4c/source/i18n/digitlst.h b/icu4c/source/i18n/digitlst.h
index bc025e2ee3..1dec44b493 100644
--- a/icu4c/source/i18n/digitlst.h
+++ b/icu4c/source/i18n/digitlst.h
@@ -137,7 +137,8 @@ public:
      * this method to determine if this is so; you cannot check directly,
      * because a special format is used to handle this.
      */
-    UBool isLONG_MIN(void) const;
+    // This code is unused.
+    //UBool isLONG_MIN(void) const;
 
 public:
     /**