diff --git a/icu4c/source/config/mh-ptx b/icu4c/source/config/mh-ptx
index 02776ba0a07..8d6cf7d0be6 100644
--- a/icu4c/source/config/mh-ptx
+++ b/icu4c/source/config/mh-ptx
@@ -40,6 +40,7 @@ LIBICU-UC= 	-L$(top_builddir)/common -licu-uc
 LIBICU-I18N= 	-L$(top_builddir)/i18n -licu-i18n
 LIBCTESTFW= 	-L$(top_builddir)/tools/ctestfw -lctestfw
 LIBICU-TOOLUTIL=-L$(top_builddir)/tools/toolutil -licu-toolutil
+LIBUSTDIO=      -L$(top_builddir)/extra/ustdio -lustdio
 
 ## Compilation rules
 %.o : $(srcdir)/%.c