diff --git a/.gitignore b/.gitignore
index ee7aeb37f0e..39bfe95f86d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,6 +41,8 @@ icu4c/include
 icu4c/lib
 icu4c/source/Makefile
 icu4c/source/README
+icu4c/source/allinone/*.ncb
+icu4c/source/allinone/*.opt
 icu4c/source/common/*.ao
 icu4c/source/common/*.d
 icu4c/source/common/*.plg
diff --git a/icu4c/source/allinone/.cvsignore b/icu4c/source/allinone/.cvsignore
new file mode 100644
index 00000000000..45b9fe94909
--- /dev/null
+++ b/icu4c/source/allinone/.cvsignore
@@ -0,0 +1,2 @@
+*.ncb
+*.opt