diff --git a/.gitignore b/.gitignore
index 2e21d2b2303..355692dc224 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,9 +56,6 @@ 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
 icu4c/source/data/*.lib
 icu4c/source/data/*.obj
diff --git a/icu4c/source/data/.cvsignore b/icu4c/source/data/.cvsignore
index 475969c5f96..647c7d08609 100644
--- a/icu4c/source/data/.cvsignore
+++ b/icu4c/source/data/.cvsignore
@@ -1,11 +1,8 @@
 Makefile
 .links
-*.dat
-*.dll
 *.exp
 *.obj
 *.lib
 *.plg
-*.cnv
 icupkg.inc
 out
\ No newline at end of file