diff --git a/.gitignore b/.gitignore
index c582f0bf5d9..2da125803c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -288,10 +288,6 @@ icu4c/source/tools/gencmn/*.plg
 icu4c/source/tools/gencmn/Debug
 icu4c/source/tools/gencmn/Makefile
 icu4c/source/tools/gencmn/Release
-icu4c/source/tools/gencmn/decmn
-icu4c/source/tools/gencmn/decmn.[0-9]
-icu4c/source/tools/gencmn/decmn_win32_Debug
-icu4c/source/tools/gencmn/decmn_win32_Release
 icu4c/source/tools/gencmn/gencmn
 icu4c/source/tools/gencmn/gencmn.[0-9]
 icu4c/source/tools/gencnval/*.d
diff --git a/icu4c/source/tools/gencmn/.cvsignore b/icu4c/source/tools/gencmn/.cvsignore
index c0ac82e0fba..513272195de 100644
--- a/icu4c/source/tools/gencmn/.cvsignore
+++ b/icu4c/source/tools/gencmn/.cvsignore
@@ -1,13 +1,9 @@
 Debug
 Release
-decmn_win32_Debug
-decmn_win32_Release
 Makefile
 *.d
 *.o
 *.pdb
+*.plg
 gencmn
 gencmn.[0-9]
-*.plg
-decmn
-decmn.[0-9]