diff --git a/icu4c/source/common/brkeng.cpp b/icu4c/source/common/brkeng.cpp
index c8442310b8b..3f58287532e 100644
--- a/icu4c/source/common/brkeng.cpp
+++ b/icu4c/source/common/brkeng.cpp
@@ -356,8 +356,8 @@ int32_t BreakEngineWrapper::findBreaks(
     foundBreaks.ensureCapacity(beforeSize+additionalCapacity, status);
     if (U_FAILURE(status)) return 0;
     foundBreaks.setSize(beforeSize + beforeSize+additionalCapacity);
-    result = delegate->fillBreak(text, rangeStart, rangeEnd, foundBreaks.getBuffer()+beforeSize,
-                                 additionalCapacity, status);
+    result = delegate->fillBreaks(text, rangeStart, rangeEnd, foundBreaks.getBuffer()+beforeSize,
+                                  additionalCapacity, status);
     if (U_FAILURE(status)) return 0;
     foundBreaks.setSize(beforeSize + result);
     utext_setNativeIndex(text, current);
diff --git a/icu4c/source/common/unicode/rbbi.h b/icu4c/source/common/unicode/rbbi.h
index c137ac5c7a8..d5e8209bc1f 100644
--- a/icu4c/source/common/unicode/rbbi.h
+++ b/icu4c/source/common/unicode/rbbi.h
@@ -100,9 +100,9 @@ class ExternalBreakEngine : public UObject {
      * @return The number of breaks found
      * @internal ICU 74 technology preview
      */
-     virtual int32_t fillBreak(UText* text,  int32_t start, int32_t end,
-                              int32_t* foundBreaks, int32_t foundBreaksCapacity,
-                              UErrorCode& status) const = 0;
+     virtual int32_t fillBreaks(UText* text,  int32_t start, int32_t end,
+                               int32_t* foundBreaks, int32_t foundBreaksCapacity,
+                               UErrorCode& status) const = 0;
 };
 #endif  /* UCONFIG_NO_SERVICE */
 #endif  /* U_HIDE_DRAFT_API */
diff --git a/icu4c/source/test/intltest/rbbitst.cpp b/icu4c/source/test/intltest/rbbitst.cpp
index c7687bad503..2afe4b3912d 100644
--- a/icu4c/source/test/intltest/rbbitst.cpp
+++ b/icu4c/source/test/intltest/rbbitst.cpp
@@ -5686,9 +5686,9 @@ class FakeTaiLeBreakEngine : public ExternalBreakEngine {
   virtual bool handles(UChar32 c) const override {
       return block.contains(c);
   }
-  virtual int32_t fillBreak(UText* text,  int32_t start, int32_t end,
-                            int32_t* foundBreaks, int32_t foundBreaksCapacity,
-                            UErrorCode& status) const override {
+  virtual int32_t fillBreaks(UText* text,  int32_t start, int32_t end,
+                             int32_t* foundBreaks, int32_t foundBreaksCapacity,
+                             UErrorCode& status) const override {
        if (U_FAILURE(status)) return 0;
        int32_t i = 0;
        // Save the state of the utext
@@ -5739,9 +5739,9 @@ class FakeYueBreakEngine : public ExternalBreakEngine {
   virtual bool handles(UChar32 c) const override {
       return block.contains(c);
   }
-  virtual int32_t fillBreak(UText* text,  int32_t start, int32_t end,
-                            int32_t* foundBreaks, int32_t foundBreaksCapacity,
-                            UErrorCode& status) const override {
+  virtual int32_t fillBreaks(UText* text,  int32_t start, int32_t end,
+                             int32_t* foundBreaks, int32_t foundBreaksCapacity,
+                             UErrorCode& status) const override {
        (void)text;
        if (U_FAILURE(status)) return 0;
        int32_t i = 0;