diff --git a/docs/curl.1 b/docs/curl.1
index eabcc9629..5cc7c7306 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -523,6 +523,13 @@ after having run curl.
 (SSL) Specify the path name to the Entropy Gathering Daemon socket. The socket
 is used to seed the random engine for SSL connections. See also the
 \fI--random-file\fP option.
+.IP "--expect100-timeout <seconds>"
+(HTTP) Maximum time in seconds that you allow curl to wait for a 100-continue
+response when curl emits an Expects: 100-continue header in its request. By
+default curl will wait one second. This option accepts decimal values! When
+curl stops waiting, it will continue as if the response has been received.
+
+(Added in 7.47.0)
 .IP "--cert-type <type>"
 (SSL) Tells curl what certificate type the provided certificate is in. PEM,
 DER and ENG are recognized types.  If not specified, PEM is assumed.
diff --git a/src/tool_cfgable.h b/src/tool_cfgable.h
index 85b8bcfee..b92a273d1 100644
--- a/src/tool_cfgable.h
+++ b/src/tool_cfgable.h
@@ -214,6 +214,7 @@ struct OperationConfig {
   char *unix_socket_path;         /* path to Unix domain socket */
   bool falsestart;
   bool path_as_is;
+  double expect100timeout;
   struct GlobalConfig *global;
   struct OperationConfig *prev;
   struct OperationConfig *next;   /* Always last in the struct */
diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index fd20cdc26..d123e231b 100644
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -179,6 +179,7 @@ static const struct LongShort aliases[]= {
   {"$O", "proxy-service-name",       TRUE},
   {"$P", "service-name",             TRUE},
   {"$Q", "proto-default",            TRUE},
+  {"$R", "expect100-timeout",        TRUE},
   {"0",   "http1.0",                 FALSE},
   {"01",  "http1.1",                 FALSE},
   {"02",  "http2",                   FALSE},
@@ -999,6 +1000,11 @@ ParameterError getparameter(char *flag,    /* f or -long-flag */
         if(err)
           return err;
         break;
+      case 'R': /* --expect100-timeout */
+        err = str2udouble(&config->expect100timeout, nextarg);
+        if(err)
+          return err;
+        break;
       }
       break;
     case '#': /* --progress-bar */
diff --git a/src/tool_help.c b/src/tool_help.c
index 4f569cde6..bbb2f66be 100644
--- a/src/tool_help.c
+++ b/src/tool_help.c
@@ -83,6 +83,7 @@ static const char *const helptext[] = {
 #ifdef USE_ENVIRONMENT
   "     --environment   Write results to environment variables (RISC OS)",
 #endif
+  "     --expect100-timeout SECONDS How long to wait for 100-continue (H)",
   " -f, --fail          Fail silently (no output at all) on HTTP errors (H)",
   "     --false-start   Enable TLS False Start.",
   " -F, --form CONTENT  Specify HTTP multipart POST data (H)",
diff --git a/src/tool_operate.c b/src/tool_operate.c
index e5506c6fa..30d60cb33 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -1358,6 +1358,11 @@ static CURLcode operate_do(struct GlobalConfig *global,
         if(config->proto_default)
           my_setopt_str(curl, CURLOPT_DEFAULT_PROTOCOL, config->proto_default);
 
+        /* new in 7.47.0 */
+        if(config->expect100timeout > 0)
+          my_setopt_str(curl, CURLOPT_EXPECT_100_TIMEOUT_MS,
+                        (long)(config->expect100timeout*1000));
+
         /* initialize retry vars for loop below */
         retry_sleep_default = (config->retry_delay) ?
           config->retry_delay*1000L : RETRY_SLEEP_DEFAULT; /* ms */