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-rw-r--r--src/tool_operate.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/tool_operate.c b/src/tool_operate.c
index 66f2139c8..2e6563a20 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -871,7 +871,8 @@ static CURLcode single_transfer(struct GlobalConfig *global,
if(config->headerfile) {
/* open file for output: */
if(strcmp(config->headerfile, "-")) {
- FILE *newfile = fopen(config->headerfile, "wb");
+ FILE *newfile;
+ newfile = fopen(config->headerfile, per->prev == NULL?"wb":"ab");
if(!newfile) {
warnf(config->global, "Failed to open %s\n", config->headerfile);
result = CURLE_WRITE_ERROR;