diff --git a/configure.ac b/configure.ac
index dd71ef0..369205a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1394,6 +1394,7 @@
 dlls/crypt32/Makefile
 dlls/ctl3d/Makefile
 dlls/d3d8/Makefile
+dlls/d3d9/Makefile
 dlls/d3dim/Makefile
 dlls/d3dx8/Makefile
 dlls/dciman32/Makefile