diff --git a/icu4c/source/data/makedata.dsp b/icu4c/source/data/makedata.dsp
index 97436ec6372..9fe2ce254a6 100644
--- a/icu4c/source/data/makedata.dsp
+++ b/icu4c/source/data/makedata.dsp
@@ -155,7 +155,7 @@ SOURCE=.\locales\resfiles.mk
 # End Source File
 # Begin Source File
 
-SOURCE=..\test\testdata\testdata.mk
+SOURCE=..\test\testdata\testdata.mak
 # End Source File
 # Begin Source File
 
diff --git a/icu4c/source/data/makedata.vcproj b/icu4c/source/data/makedata.vcproj
index a356c0f77d0..620c6bc4730 100644
--- a/icu4c/source/data/makedata.vcproj
+++ b/icu4c/source/data/makedata.vcproj
@@ -57,11 +57,14 @@
 			<File
 				RelativePath=".\misc\miscfiles.mk">
 			</File>
+			<File
+				RelativePath=".\rbnf\rbnffiles.mk">
+			</File>
 			<File
 				RelativePath=".\locales\resfiles.mk">
 			</File>
 			<File
-				RelativePath="..\test\testdata\testdata.mk">
+				RelativePath="..\test\testdata\testdata.mak">
 			</File>
 			<File
 				RelativePath=".\translit\trnsfiles.mk">
diff --git a/icu4c/source/test/testdata/testdata.mk b/icu4c/source/test/testdata/testdata.mak
similarity index 100%
rename from icu4c/source/test/testdata/testdata.mk
rename to icu4c/source/test/testdata/testdata.mak