diff --git a/gst/audiovisualizers/Makefile.am b/gst/audiovisualizers/Makefile.am
index 8753b9fb60..ec9b05f75f 100644
--- a/gst/audiovisualizers/Makefile.am
+++ b/gst/audiovisualizers/Makefile.am
@@ -16,7 +16,7 @@ libgstaudiovisualizers_la_LIBADD = \
 libgstaudiovisualizers_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 libgstaudiovisualizers_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
 
-+noinst_HEADERS = gstdrawhelpers.h \
+noinst_HEADERS = gstdrawhelpers.h \
 	gstspacescope.h \
 	gstspectrascope.h \
 	gstsynaescope.h \