diff --git a/libfreefare/Makefile.am b/libfreefare/Makefile.am
index 9c5947a..77e8bde 100644
--- a/libfreefare/Makefile.am
+++ b/libfreefare/Makefile.am
@@ -26,7 +26,7 @@ if HAS_LIBUTIL
     libfreefare_la_LIBADD += -lutil
 else # HAS_LIBUTIL
     libfreefare_la_LIBADD += $(top_builddir)/contrib/libutil/libutil.la
-    AM_CFLAGS += -I$(top_builddir)/contrib/libutil/
+    AM_CFLAGS += -I$(top_srcdir)/contrib/libutil/
 endif # !HAS_LIBUTIL
 endif # WITH_DEBUG