diff --git a/v3/internal/sysinfo/memtotal_js.go b/v3/internal/sysinfo/memtotal_js.go
new file mode 100644
index 000000000..a0d81766f
--- /dev/null
+++ b/v3/internal/sysinfo/memtotal_js.go
@@ -0,0 +1,11 @@
+// Copyright 2020 New Relic Corporation. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package sysinfo
+
+import "errors"
+
+// PhysicalMemoryBytes returns the total amount of host memory.
+func PhysicalMemoryBytes() (uint64, error) {
+	return 0, errors.New("not supported on GOOS=js")
+}
diff --git a/v3/internal/sysinfo/usage_js.go b/v3/internal/sysinfo/usage_js.go
new file mode 100644
index 000000000..74f8ce160
--- /dev/null
+++ b/v3/internal/sysinfo/usage_js.go
@@ -0,0 +1,11 @@
+// Copyright 2020 New Relic Corporation. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package sysinfo
+
+import "errors"
+
+// GetUsage gathers process times.
+func GetUsage() (Usage, error) {
+	return Usage{}, errors.New("not supported on GOOS=js")
+}
diff --git a/v3/internal/sysinfo/usage_posix.go b/v3/internal/sysinfo/usage_posix.go
index 4d758dea1..5b553fd90 100644
--- a/v3/internal/sysinfo/usage_posix.go
+++ b/v3/internal/sysinfo/usage_posix.go
@@ -1,7 +1,7 @@
 // Copyright 2020 New Relic Corporation. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-// +build !windows
+// +build !windows,!js
 
 package sysinfo