diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index c0bfea01c4..c9dcf23fc3 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -198,7 +198,7 @@ introspection_files = \
 		$(gdk_c_sources) \
         gdkenumtypes.c \
         gdkenumtypes.h \
-        $(srcdir)/x11/*.c
+        x11/*.c
 
 Gdk-3.0.gir: $(gdktargetlib) Makefile
 Gdk_3_0_gir_SCANNERFLAGS = --strip-prefix=Gdk --add-include-path=../gdk-pixbuf