diff --git a/icu4c/source/tools/toolutil/toolutil.dsp b/icu4c/source/tools/toolutil/toolutil.dsp
index 5c7d011e216..c2e14539221 100644
--- a/icu4c/source/tools/toolutil/toolutil.dsp
+++ b/icu4c/source/tools/toolutil/toolutil.dsp
@@ -89,6 +89,10 @@ SOURCE=.\toolutil.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\ucmpwrit.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\unewdata.c
 # End Source File
 # End Group