diff --git a/configure.ac b/configure.ac
index 9a7b103d0c..454e643a92 100644
--- a/configure.ac
+++ b/configure.ac
@@ -96,9 +96,11 @@ else
 	AC_MSG_RESULT([no])
 fi
 
+TOPDIR=`/bin/pwd`
+
 # Add "V=1" to KERNELMAKE_PARAMS to enable verbose module build
 KERNELMAKE_PARAMS=
-KERNELCPPFLAGS="-I`/bin/pwd`/include"
+KERNELCPPFLAGS="-I$TOPDIR -I$TOPDIR/include"
 
 if test "$kernelbuild" != "$kernelsrc"; then
 	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$kernelbuild"