diff --git a/icu4c/source/tools/rbdump/read.c b/icu4c/source/tools/rbdump/read.c
index 13024e2330a..94fe8f17d4e 100644
--- a/icu4c/source/tools/rbdump/read.c
+++ b/icu4c/source/tools/rbdump/read.c
@@ -31,7 +31,6 @@
 static void usage();
 static void version();
 static void processFile(const char *filename, UErrorCode *status);
-static const char* errorName(UErrorCode status);
 int main(int argc, char **argv);
 
 /* The version of rbdump */