diff --git a/l10ntools/Executable_helpex.mk b/l10ntools/Executable_helpex.mk
index c7f5cce1c0f3..011867174192 100644
--- a/l10ntools/Executable_helpex.mk
+++ b/l10ntools/Executable_helpex.mk
@@ -23,6 +23,7 @@ $(eval $(call gb_Executable_use_externals,helpex,\
 	boost_headers \
 	icu_headers \
     libxml2 \
+	icudata \
     icuuc \
     icui18n \
 ))