diff --git a/src/plugins/splash/script/Makefile.am b/src/plugins/splash/script/Makefile.am
index d7af4d83..8cafc3ef 100644
--- a/src/plugins/splash/script/Makefile.am
+++ b/src/plugins/splash/script/Makefile.am
@@ -47,7 +47,7 @@ script_la_SOURCES = $(srcdir)/plugin.c                                        \
 MAINTAINERCLEANFILES = Makefile.in
 CLEANFILES = *.string
 
-BUILT_SOURCES = script-lib-image.c script-lib-sprite.c script-lib-math.c script-lib-plymouth.c
+BUILT_SOURCES = script-lib-image.string script-lib-sprite.string script-lib-math.string script-lib-plymouth.string
 
 EXTRA_DIST = stringify.pl