diff --git a/toolkit/components/glean/bindings/private/Labeled.h b/toolkit/components/glean/bindings/private/Labeled.h
index 5e11678fb9d0..2a4c0fc83e0a 100644
--- a/toolkit/components/glean/bindings/private/Labeled.h
+++ b/toolkit/components/glean/bindings/private/Labeled.h
@@ -30,7 +30,7 @@ namespace impl {
 template <typename T, typename E>
 class Labeled {
  public:
-  constexpr explicit Labeled<T, E>(uint32_t id) : mId(id) {}
+  constexpr explicit Labeled(uint32_t id) : mId(id) {}
 
   /**
    * Gets a specific metric for a given label.