diff --git a/gst-libs/gst/gl/Makefile.am b/gst-libs/gst/gl/Makefile.am
index 5572d2d7a0..196bdeed61 100644
--- a/gst-libs/gst/gl/Makefile.am
+++ b/gst-libs/gst/gl/Makefile.am
@@ -129,6 +129,7 @@ configexecincludedir = $(libdir)/gstreamer-@GST_API_VERSION@/include/gst/gl
 nodist_configexecinclude_HEADERS = $(built_sys_header_configure)
 
 libgstgl_@GST_API_VERSION@_la_CFLAGS = \
+	-DGST_EXPORTS \
 	-I$(top_srcdir)/gst-libs \
 	-I$(top_builddir)/gst-libs \
 	$(GST_PLUGINS_BASE_CFLAGS) \
diff --git a/gst-libs/gst/gl/win32/Makefile.am b/gst-libs/gst/gl/win32/Makefile.am
index 40f591c08a..ed3cc6320d 100644
--- a/gst-libs/gst/gl/win32/Makefile.am
+++ b/gst-libs/gst/gl/win32/Makefile.am
@@ -16,6 +16,7 @@ noinst_HEADERS += gstglcontext_wgl.h
 endif
 
 libgstgl_win32_la_CFLAGS = \
+	-DGST_EXPORTS \
 	-I$(top_srcdir)/gst-libs \
 	-I$(top_builddir)/gst-libs \
 	$(GL_CFLAGS) \