diff --git a/icu4c/source/tools/genbrk/genbrk.cpp b/icu4c/source/tools/genbrk/genbrk.cpp
index 1937247142a..f9ebc246457 100644
--- a/icu4c/source/tools/genbrk/genbrk.cpp
+++ b/icu4c/source/tools/genbrk/genbrk.cpp
@@ -311,8 +311,8 @@ int  main(int argc, char **argv) {
 
     fclose(file);
     delete bi;
-    delete ruleSourceU;
-    delete ruleBufferC;
+    delete[] ruleSourceU;
+    delete[] ruleBufferC;
     u_cleanup();