diff --git a/libavformat/http.c b/libavformat/http.c
index a0a0636cf2..072a6ce0b9 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -915,7 +915,7 @@ static int process_line(URLContext *h, char *line, int line_count,
             while (av_isspace(*p))
                 p++;
             resource = p;
-            while (!av_isspace(*p))
+            while (*p && !av_isspace(*p))
                 p++;
             *(p++) = '\0';
             av_log(h, AV_LOG_TRACE, "Requested resource: %s\n", resource);