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-rw-r--r--lib/if2ip.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/if2ip.h b/lib/if2ip.h
index f2c3a541f..30a6540a4 100644
--- a/lib/if2ip.h
+++ b/lib/if2ip.h
@@ -26,7 +26,7 @@
#if !defined(WIN32) && !defined(__BEOS__) && !defined(__CYGWIN32__) && \
!defined(__riscos__) && !defined(__INTERIX)
-extern char *Curl_if2ip(char *interface, char *buf, int buf_size);
+extern char *Curl_if2ip(const char *interface, char *buf, int buf_size);
#else
#define Curl_if2ip(a,b,c) NULL
#endif