diff --git a/promql/fuzz.go b/promql/fuzz.go
index c07653dfcb..b15e661eaa 100644
--- a/promql/fuzz.go
+++ b/promql/fuzz.go
@@ -12,6 +12,7 @@
 // limitations under the License.
 
 // Only build when go-fuzz is in use
+//go:build gofuzz
 
 package promql