diff --git a/ext/gtk/Makefile.am b/ext/gtk/Makefile.am
index 7736b24ef2..34906257f4 100644
--- a/ext/gtk/Makefile.am
+++ b/ext/gtk/Makefile.am
@@ -27,7 +27,8 @@ libgstgtk_la_CFLAGS = \
 	$(GTK3_CFLAGS) \
 	$(GST_CFLAGS) \
 	$(GST_BASE_CFLAGS) \
-	$(GST_PLUGINS_BASE_CFLAGS)
+	$(GST_PLUGINS_BASE_CFLAGS) \
+	$(GL_CFLAGS)
 libgstgtk_la_LIBADD = \
 	$(GTK3_LIBS) \
 	$(GST_BASE_LIBS) \
diff --git a/ext/gtk/gstgtkglsink.c b/ext/gtk/gstgtkglsink.c
index 56326882a9..39b54faf86 100644
--- a/ext/gtk/gstgtkglsink.c
+++ b/ext/gtk/gstgtkglsink.c
@@ -27,6 +27,8 @@
 #include "config.h"
 #endif
 
+#include <gst/gl/gstglfuncs.h>
+
 #include "gstgtkglsink.h"
 #include "gtkgstglwidget.h"
 
diff --git a/ext/gtk/gtkgstglwidget.c b/ext/gtk/gtkgstglwidget.c
index ea0fe2f8ab..2423afca00 100644
--- a/ext/gtk/gtkgstglwidget.c
+++ b/ext/gtk/gtkgstglwidget.c
@@ -26,6 +26,7 @@
 
 #include "gtkgstglwidget.h"
 #include "gstgtkutils.h"
+#include <gst/gl/gstglfuncs.h>
 #include <gst/video/video.h>
 
 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
diff --git a/tests/examples/gtk/glliveshader.c b/tests/examples/gtk/glliveshader.c
index 5a71bc3fcb..03e745ee36 100644
--- a/tests/examples/gtk/glliveshader.c
+++ b/tests/examples/gtk/glliveshader.c
@@ -20,6 +20,7 @@
 
 #include <gst/gst.h>
 #include <gst/gl/gl.h>
+#include <gst/gl/gstglfuncs.h>
 #include <gtk/gtk.h>
 #if GST_GL_HAVE_WINDOW_X11
 #include <X11/Xlib.h>