diff --git a/slang/Makefile.am b/slang/Makefile.am
index d43a3ae5e..4d6f3529b 100644
--- a/slang/Makefile.am
+++ b/slang/Makefile.am
@@ -1,4 +1,4 @@
-AM_CFLAGS = $(GLIB_CFLAGS) -Iinclude
+AM_CFLAGS = $(GLIB_CFLAGS) -I$(srcdir)/include
 
 if INCLUDED_SLANG
 noinst_LIBRARIES = libmcslang.a