diff --git a/pkg/executer/executer_http.go b/pkg/executer/executer_http.go
index a4008f5b..6fa591dc 100644
--- a/pkg/executer/executer_http.go
+++ b/pkg/executer/executer_http.go
@@ -369,7 +369,7 @@ func makeCheckRedirectFunc(followRedirects bool, maxRedirects int) checkRedirect
 func (e *HTTPExecuter) setCustomHeaders(r *requests.HTTPRequest) {
 	for _, customHeader := range e.customHeaders {
 		// This should be pre-computed somewhere and done only once
-		tokens := strings.Split(customHeader, ":")
+		tokens := strings.SplitN(customHeader, ":", 2)
 		// if it's an invalid header skip it
 		if len(tokens) < two {
 			continue