diff --git a/configure.ac b/configure.ac
index eb47f77b8a..a885ce47f3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -595,7 +595,7 @@ AC_SUBST(LIBGST_CFLAGS)
 
 dnl Vars for everyone else
 GST_INT_LIBS="\$(top_builddir)/gst/libgst.la"
-GST_INT_CFLAGS="-I\$(top_srcdir)/libs -I\$(top_srcdir)/include -I\$(top_srcdir)"
+GST_INT_CFLAGS="-I\$(top_srcdir)/libs -I\$(top_srcdir)/include -I\$(top_srcdir) -Wall"
 
 AC_SUBST(GST_CFLAGS, "$GST_EXT_CFLAGS $GST_INT_CFLAGS")
 AC_SUBST(GST_LIBS, "$GST_EXT_LIBS $GST_INT_LIBS")