diff --git a/.gitignore b/.gitignore
index 647cf94535f..9fffddf5201 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,6 +56,7 @@ icu4c/source/config.cache
 icu4c/source/config.log
 icu4c/source/config.status
 icu4c/source/config/Makefile.inc
+icu4c/source/data/*.cnv
 icu4c/source/data/*.dat
 icu4c/source/data/*.dll
 icu4c/source/data/*.exp
diff --git a/icu4c/source/data/.cvsignore b/icu4c/source/data/.cvsignore
index bd337b436ea..475969c5f96 100644
--- a/icu4c/source/data/.cvsignore
+++ b/icu4c/source/data/.cvsignore
@@ -6,5 +6,6 @@ Makefile
 *.obj
 *.lib
 *.plg
+*.cnv
 icupkg.inc
 out
\ No newline at end of file