diff --git a/icu4c/source/extra/uconv/makedata.mak b/icu4c/source/extra/uconv/makedata.mak
index 3a07f2e3b5..6162deb86f 100644
--- a/icu4c/source/extra/uconv/makedata.mak
+++ b/icu4c/source/extra/uconv/makedata.mak
@@ -70,7 +70,7 @@ PATH = $(PATH);$(ICUP)\bin
 .SUFFIXES : .ucm .cnv .dll .dat .res .txt .c
 
 # We're including a list of resource files.
-FILESEPCHAR=\
+FILESEPCHAR=\\
 
 !IF EXISTS("$(RESFILES)")
 !INCLUDE "$(RESFILES)"