diff --git a/pkg/protocols/offlinehttp/operators.go b/pkg/protocols/offlinehttp/operators.go
index cbce83cb6..3164c086a 100644
--- a/pkg/protocols/offlinehttp/operators.go
+++ b/pkg/protocols/offlinehttp/operators.go
@@ -109,7 +109,7 @@ func (request *Request) responseToDSLMap(resp *http.Response, host, matched, raw
 		data[strings.ToLower(cookie.Name)] = cookie.Value
 	}
 	for k, v := range resp.Header {
-		k = strings.ToLower(strings.TrimSpace(k))
+		k = strings.ToLower(strings.ReplaceAll(strings.TrimSpace(k), "-", "_"))
 		data[k] = strings.Join(v, " ")
 	}
 
diff --git a/pkg/protocols/offlinehttp/operators_test.go b/pkg/protocols/offlinehttp/operators_test.go
index 21bb86939..4fb8c39f7 100644
--- a/pkg/protocols/offlinehttp/operators_test.go
+++ b/pkg/protocols/offlinehttp/operators_test.go
@@ -134,7 +134,7 @@ func TestHTTPOperatorExtract(t *testing.T) {
 	event := request.responseToDSLMap(resp, host, matched, exampleRawRequest, exampleRawResponse, exampleResponseBody, exampleResponseHeader, 1*time.Second, map[string]interface{}{})
 	require.Len(t, event, 14, "could not get correct number of items in dsl map")
 	require.Equal(t, exampleRawResponse, event["response"], "could not get correct resp")
-	require.Equal(t, "Test-Response", event["test-header"], "could not get correct resp for header")
+	require.Equal(t, "Test-Response", event["test_header"], "could not get correct resp for header")
 
 	t.Run("extract", func(t *testing.T) {
 		extractor := &extractors.Extractor{
@@ -153,7 +153,7 @@ func TestHTTPOperatorExtract(t *testing.T) {
 	t.Run("kval", func(t *testing.T) {
 		extractor := &extractors.Extractor{
 			Type: extractors.ExtractorTypeHolder{ExtractorType: extractors.KValExtractor},
-			KVal: []string{"test-header"},
+			KVal: []string{"test_header"},
 			Part: "header",
 		}
 		err = extractor.CompileExtractors()