diff --git a/configure.ac b/configure.ac
index 0d30b3e8d..82d74c6ac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3405,8 +3405,10 @@ $ac_cv_sizeof___int64)
   ;;
 esac
 
-AC_CHECK_ALIGNOF([guint32], [typedef unsigned $gint32 guint32;])
-AC_CHECK_ALIGNOF([guint64], typedef unsigned $gint64 guint64;)
+AC_CHECK_ALIGNOF([guint32], [AC_INCLUDES_DEFAULT
+typedef unsigned $gint32 guint32;])
+AC_CHECK_ALIGNOF([guint64], [AC_INCLUDES_DEFAULT
+typedef unsigned $gint64 guint64;])
 AC_CHECK_ALIGNOF([unsigned long])
 
 # Check for libdbus1 - Optional - is only used in the GDBus test cases