--- a/toolkit/devtools/server/tests/gtest/DeserializedNodeUbiNodes.cpp
+++ b/toolkit/devtools/server/tests/gtest/DeserializedNodeUbiNodes.cpp
@@ -34,18 +34,18 @@ size_t fakeMallocSizeOf(const void*) {
   MOZ_ASSERT_UNREACHABLE("fakeMallocSizeOf should never be called because "
                          "DeserializedNodes report the deserialized size.");
   return 0;
 }
 
 DEF_TEST(DeserializedNodeUbiNodes, {
     const char16_t* typeName = MOZ_UTF16("TestTypeName");
 
-    NodeId id = uint64_t(1) << 33;
-    uint64_t size = uint64_t(1) << 60;
+    NodeId id = 1L << 33;
+    uint64_t size = 1L << 60;
     MockDeserializedNode mocked(id, typeName, size);
 
     DeserializedNode& deserialized = mocked;
     JS::ubi::Node ubi(&deserialized);
 
     // Test the ubi::Node accessors.
 
     EXPECT_EQ(size, ubi.size(fakeMallocSizeOf));