diff --git a/perl-5.18.2-overflow.diff b/perl-5.18.2-overflow.diff
index f4ab898..d89a47d 100644
--- a/perl-5.18.2-overflow.diff
+++ b/perl-5.18.2-overflow.diff
@@ -5,7 +5,7 @@
  #ifndef NV_PRESERVES_UV
  		&& (((UV)1 << NV_PRESERVES_UV_BITS) >
 -		    (UV)(SvIVX(sv) > 0 ? SvIVX(sv) : -SvIVX(sv)))
-+		    (UV)(SvIVX(sv) > 0 ? SvIVX(sv) : -SvUVX(sv)))
++		    (UV)(SvIVX(sv) > 0 ? (UV)SvIVX(sv) : -(UV)SvIVX(sv)))
  		/* Don't flag it as "accurately an integer" if the number
  		   came from a (by definition imprecise) NV operation, and
  		   we're outside the range of NV integer precision */