1 files changed, 1 insertions, 1 deletions
diff --git a/sv.c b/sv.c
index 308ecf8a8c..429794fc98 100644
--- a/sv.c
+++ b/sv.c
@@ -3924,7 +3924,7 @@ Perl_sv_usepvn_flags(pTHX_ SV *sv, char *ptr, STRLEN len, U32 flags)
 	assert(ptr[len] == '\0');
 
     allocate = (flags & SV_HAS_TRAILING_NUL)
-	? len : PERL_STRLEN_ROUNDUP(len + 1);
+	? len + 1: PERL_STRLEN_ROUNDUP(len + 1);
 #ifdef DEBUGGING
     {
 	/* Force a move to shake out bugs in callers.  */