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-rw-r--r--Src/exec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/exec.c b/Src/exec.c
index aa78a7ce6..595d26532 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -2395,7 +2395,7 @@ save_params(Estate state, Wordcode pc, LinkList *restore_p, LinkList *remove_p)
 	    } else if (!(pm->flags & PM_READONLY) &&
 		       (unset(RESTRICTED) || !(pm->flags & PM_RESTRICTED))) {
 		Param tpm = (Param) zhalloc(sizeof *tpm);
-		tpm->nam = s;
+		tpm->nam = dupstring(s);
 		copyparam(tpm, pm, 1);
 		pm = tpm;
 	    }