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-rw-r--r--crypto/stack/stack.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/stack/stack.h b/crypto/stack/stack.h
index a6665f3b30..0cc3b44cc0 100644
--- a/crypto/stack/stack.h
+++ b/crypto/stack/stack.h
@@ -79,7 +79,7 @@ typedef struct stack_st
#define M_sk_num(sk) ((sk) ? (sk)->num:-1)
#define M_sk_value(sk,n) ((sk) ? (sk)->data[n] : NULL)
-int sk_num(STACK *);
+int sk_num(const STACK *);
char *sk_value(STACK *, int);
char *sk_set(STACK *, int, char *);