diff --git a/lib/headers.c b/lib/headers.c
index 6cd7e31703..457ed63eda 100644
--- a/lib/headers.c
+++ b/lib/headers.c
@@ -336,6 +336,7 @@ CURLcode Curl_headers_push(struct Curl_easy *data, const char *header,
 static void headers_init(struct Curl_easy *data)
 {
   Curl_llist_init(&data->state.httphdrs, NULL);
+  data->state.prevhead = NULL;
 }
 
 /*