diff --git a/icu4c/source/test/testdata/testdata.mk b/icu4c/source/test/testdata/testdata.mk
index 45540431f83..eb33c72f766 100644
--- a/icu4c/source/test/testdata/testdata.mk
+++ b/icu4c/source/test/testdata/testdata.mk
@@ -30,4 +30,4 @@ test.dat
         @"$(ICUTOOLS)\genrb\$(CFG)\genrb" -s$(TESTDATA) -d$(TESTDATA) $(?F)
 
 test.dat : {"$(ICUTOOLS)\gentest\$(CFG)"}gentest.exe
-	"$(ICUTOOLS)\gentest\$(CFG)"\gentest.exe -d$(TESTDATA)
\ No newline at end of file
+	"$(ICUTOOLS)\gentest\$(CFG)\gentest" -d$(TESTDATA)
\ No newline at end of file