diff --git a/tests/fuzz/fuzz_test.go b/tests/fuzz/fuzz_test.go
index 25a6ed8213..d16f26c085 100644
--- a/tests/fuzz/fuzz_test.go
+++ b/tests/fuzz/fuzz_test.go
@@ -27,6 +27,7 @@ var renderContext = markup.RenderContext{
 
 func FuzzMarkdownRenderRaw(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
+		setting.IsInTesting = true
 		setting.AppURL = "http://localhost:3000/"
 		markdown.RenderRaw(&renderContext, bytes.NewReader(data), io.Discard)
 	})
@@ -34,6 +35,7 @@ func FuzzMarkdownRenderRaw(f *testing.F) {
 
 func FuzzMarkupPostProcess(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
+		setting.IsInTesting = true
 		setting.AppURL = "http://localhost:3000/"
 		markup.PostProcess(&renderContext, bytes.NewReader(data), io.Discard)
 	})