diff --git a/configure b/configure
index ed894e52..501f19b1 100755
--- a/configure
+++ b/configure
@@ -3890,7 +3890,7 @@ esac
 
 case "X$WITH_KERNELSRC" in
     Xyes | Xno | X)
-	WITH_KERNELSRC='/lib/modules/`uname -r`/build'
+	WITH_KERNELSRC="/lib/modules/`uname -r`/build"
 	;;
     X/*)
 	;;
diff --git a/configure.ac b/configure.ac
index 01356507..d5e4621c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -153,7 +153,7 @@ esac
 
 case "X$WITH_KERNELSRC" in
     Xyes | Xno | X)
-	WITH_KERNELSRC='/lib/modules/`uname -r`/build'
+	WITH_KERNELSRC="/lib/modules/`uname -r`/build"
 	;;
     X/*)
 	;;