diff --git a/tools/icu/shrink-icu-src.py b/tools/icu/shrink-icu-src.py
index 4a5f06d4a3bec1..d0c82d87468dc0 100644
--- a/tools/icu/shrink-icu-src.py
+++ b/tools/icu/shrink-icu-src.py
@@ -33,7 +33,7 @@
     shutil.rmtree(options.icusmall)
 
 if not os.path.isdir(options.icusrc):
-    print 'Missing source ICU dir --icusrc=%' % (options.icusrc)
+    print 'Missing source ICU dir --icusrc=%s' % (options.icusrc)
     sys.exit(1)