diff --git a/arch/arm/vfp/vfpdouble.c b/arch/arm/vfp/vfpdouble.c
index 4fc05ee..e44b9ed 100644
--- a/arch/arm/vfp/vfpdouble.c
+++ b/arch/arm/vfp/vfpdouble.c
@@ -56,7 +56,7 @@
 {
 	int bits = 31 - fls(vd->significand >> 32);
 	if (bits == 31)
-		bits = 62 - fls(vd->significand);
+		bits = 63 - fls(vd->significand);
 
 	vfp_double_dump("normalise_denormal: in", vd);