diff --git a/security/sandbox/linux/SandboxFilter.cpp b/security/sandbox/linux/SandboxFilter.cpp
index 6b51402831b5..8c9621dd7a4e 100644
--- a/security/sandbox/linux/SandboxFilter.cpp
+++ b/security/sandbox/linux/SandboxFilter.cpp
@@ -467,6 +467,7 @@ public:
     case SHMDT:
     case SEMGET:
     case SEMCTL:
+    case SEMOP:
       return Some(Allow());
     default:
       return SandboxPolicyCommon::EvaluateIpcCall(aCall);