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-rw-r--r--include/curl/curl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/curl/curl.h b/include/curl/curl.h
index ae7573955..ec8d182b5 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -493,7 +493,7 @@ void curl_formfree(struct HttpPost *form);
/* Unix and Win32 getenv function call, this returns a malloc()'ed string that
MUST be free()ed after usage is complete. */
-char *curl_getenv(char *variable);
+char *curl_getenv(const char *variable);
/* Returns a static ascii string of the libcurl version. */
char *curl_version(void);