diff --git a/rlimit_nonposix.go b/rlimit_nonposix.go
index dd3214774..05ca942d3 100644
--- a/rlimit_nonposix.go
+++ b/rlimit_nonposix.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build windows plan9 nacl
+// +build windows plan9 nacl js
 
 package caddy
 
diff --git a/rlimit_posix.go b/rlimit_posix.go
index dc9b2959e..9e85bf661 100644
--- a/rlimit_posix.go
+++ b/rlimit_posix.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !windows,!plan9,!nacl
+// +build !windows,!plan9,!nacl,!js
 
 package caddy
 
diff --git a/sigtrap_nonposix.go b/sigtrap_nonposix.go
index 3fb886476..517e3a2e4 100644
--- a/sigtrap_nonposix.go
+++ b/sigtrap_nonposix.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build windows plan9 nacl
+// +build windows plan9 nacl js
 
 package caddy
 
diff --git a/sigtrap_posix.go b/sigtrap_posix.go
index 9d0bab9cb..fb9703611 100644
--- a/sigtrap_posix.go
+++ b/sigtrap_posix.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !windows,!plan9,!nacl
+// +build !windows,!plan9,!nacl,!js
 
 package caddy