diff --git a/config.def.h b/config.def.h
index c96b6a0..c600f1c 100644
--- a/config.def.h
+++ b/config.def.h
@@ -38,7 +38,7 @@ static const Rule rules[] = {
 static const float mfact     = 0.55; /* factor of master area size [0.05..0.95] */
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 0;    /* 1 means respect size hints in tiled resizals */
-static const int attachbelow = 0;    /* 1 means attach after the currently active window */
+static int attachbelow = 0;    /* 1 means attach after the currently active window */
 
 #include "tcl.c"
 #include "fibonacci.c"