1 files changed, 6 insertions, 5 deletions
diff --git a/toke.c b/toke.c
index 7587df1860..b275c6ab9e 100644
--- a/toke.c
+++ b/toke.c
@@ -3611,12 +3611,13 @@ Perl_yylex(pTHX)
 		}
 	    } else
 		sv_setpvs(PL_linestr,"");
-	    if (PL_preambleav){
-		while(AvFILLp(PL_preambleav) >= 0) {
-		    SV *tmpsv = av_shift(PL_preambleav);
-		    sv_catsv(PL_linestr, tmpsv);
+	    if (PL_preambleav) {
+		SV **svp = AvARRAY(PL_preambleav);
+		SV **const end = svp + AvFILLp(PL_preambleav);
+		while(svp <= end) {
+		    sv_catsv(PL_linestr, *svp);
+		    ++svp;
 		    sv_catpvs(PL_linestr, ";");
-		    sv_free(tmpsv);
 		}
 		sv_free((SV*)PL_preambleav);
 		PL_preambleav = NULL;