diff --git a/soap.go b/soap.go
index 169d494..dc5dd43 100644
--- a/soap.go
+++ b/soap.go
@@ -44,6 +44,7 @@ type Client struct {
 	WSDL         string
 	URL          string
 	Method       string
+	SoapAction   string
 	Params       Params
 	HeaderName   string
 	HeaderParams HeaderParams
@@ -65,6 +66,10 @@ func (c *Client) GetLastRequest() []byte {
 func (c *Client) Call(m string, p Params) (err error) {
 	c.Method = m
 	c.Params = p
+	c.SoapAction = c.Definitions.GetSoapActionFromWsdlOperation(c.Method)
+	if c.SoapAction == "" {
+		c.SoapAction = fmt.Sprintf("%s/%s", c.URL, c.Method)
+	}
 
 	c.payload, err = xml.MarshalIndent(c, "", "    ")
 	if err != nil {
@@ -120,7 +125,7 @@ func (c *Client) doRequest(url string) ([]byte, error) {
 
 	req.Header.Add("Content-Type", "text/xml;charset=UTF-8")
 	req.Header.Add("Accept", "text/xml")
-	req.Header.Add("SOAPAction", fmt.Sprintf("%s/%s", c.URL, c.Method))
+	req.Header.Add("SOAPAction", c.SoapAction)
 
 	resp, err := c.HttpClient.Do(req)
 	if err != nil {
diff --git a/wsdl.go b/wsdl.go
index ff4d1e5..abf3bf1 100644
--- a/wsdl.go
+++ b/wsdl.go
@@ -167,6 +167,23 @@ func getWsdlDefinitions(u string) (wsdl *wsdlDefinitions, err error) {
 	return wsdl, err
 }
 
+// the SoapAction of an operation might differ from the action wsdl-operation name
+// if any SoapAction name is set in the wsdlOperation binding, use that.
+func (wsdl *wsdlDefinitions) GetSoapActionFromWsdlOperation(operation string) string {
+	// in the future it would be nice to have Operations be map[string]*wsdlOperation,
+	// where the map key is the wsdlOperation name
+	if wsdl.Bindings[0] != nil {
+		for _, o := range wsdl.Bindings[0].Operations {
+			if o.Name == operation {
+				if o.SoapOperations[0] != nil {
+					return o.SoapOperations[0].SoapAction
+				}
+			}
+		}
+	}
+	return ""
+}
+
 // Fault response
 type Fault struct {
 	Code        string `xml:"faultcode"`