diff --git a/gtk+-3.0.pc.in b/gtk+-3.0.pc.in
index d5d83939e1..e628ab1ef7 100644
--- a/gtk+-3.0.pc.in
+++ b/gtk+-3.0.pc.in
@@ -12,4 +12,4 @@ Description: GTK+ Graphical UI Library
 Version: @VERSION@
 Requires: gdk-@GTK_API_VERSION@ @GTK_PACKAGES@
 Libs: -L${libdir} -lgtk-3 @GTK_EXTRA_LIBS@
-Cflags: -I${includedir}/gtk-@GTK_API_VERSION@ @GTK_EXTRA_CFLAGS@ -DGSEAL_ENABLE
+Cflags: -I${includedir}/gtk-@GTK_API_VERSION@ @GTK_EXTRA_CFLAGS@