diff --git a/lib/lightning.c b/lib/lightning.c
index 613e66358..66fcca7eb 100644
--- a/lib/lightning.c
+++ b/lib/lightning.c
@@ -24,7 +24,7 @@
 #define jit_regload_isdead		2	/* delete and unset live bit */
 
 #if __WORDSIZE == 32
-#  define bmp_shift			3
+#  define bmp_shift			5
 #else
 #  define bmp_shift			6
 #endif