diff --git a/icu4c/source/tools/genrb/genrb.c b/icu4c/source/tools/genrb/genrb.c
index 1077c89290..05205e3350 100644
--- a/icu4c/source/tools/genrb/genrb.c
+++ b/icu4c/source/tools/genrb/genrb.c
@@ -230,7 +230,7 @@ processFile(const char *filename, const char *cp, const char *inputDir, const ch
   ucbuf = ucbuf_open(in,cp,status);
 
   /* Parse the data into an SRBRoot */
-  data = parse(ucbuf, cp, inputDir, status);
+  data = parse(ucbuf, inputDir, status);
 
   /* Determine the target rb filename */
   rbname = make_res_filename(filename, outputDir,  status);
diff --git a/icu4c/source/tools/genrb/parse.c b/icu4c/source/tools/genrb/parse.c
index 2003149074..61d8d2ee5f 100644
--- a/icu4c/source/tools/genrb/parse.c
+++ b/icu4c/source/tools/genrb/parse.c
@@ -212,7 +212,7 @@ int32_t lineCount = 0;
 char lastTag[200] = "";
 
 struct SRBRoot*
-parse(UCHARBUF* buf, const char *cp, const char *inputDir,
+parse(UCHARBUF* buf, const char *inputDir,
       UErrorCode *status)
 {
     enum ETokenType type;
@@ -436,7 +436,6 @@ parse(UCHARBUF* buf, const char *cp, const char *inputDir,
                           importFile = T_FileStream_open(fileName, "rb");
                         } else {
                           char *openFileName = NULL;
-                          int32_t dirlen = uprv_strlen(inputDir);
                           int32_t filelen = uprv_strlen(fileName);
                           if(inputDir[dirlen-1] != U_FILE_SEP_CHAR) {
                             openFileName = (char *) uprv_malloc(dirlen+filelen+2);
diff --git a/icu4c/source/tools/genrb/parse.h b/icu4c/source/tools/genrb/parse.h
index 20ae33479d..350198db52 100644
--- a/icu4c/source/tools/genrb/parse.h
+++ b/icu4c/source/tools/genrb/parse.h
@@ -24,6 +24,6 @@
 #include "ucbuf.h"
 
 /* Parse a ResourceBundle text file */
-struct SRBRoot* parse(UCHARBUF* buf, const char *cp, const char* inputDir, UErrorCode *status);
+struct SRBRoot* parse(UCHARBUF* buf, const char* inputDir, UErrorCode *status);
 
 #endif