diff --git a/plugin/rpcplugin/sandbox/sandbox_linux.go b/plugin/rpcplugin/sandbox/sandbox_linux.go
index dad485f682..c83572c820 100644
--- a/plugin/rpcplugin/sandbox/sandbox_linux.go
+++ b/plugin/rpcplugin/sandbox/sandbox_linux.go
@@ -267,7 +267,7 @@ func pivotRoot(newRoot string) error {
 func dropInheritableCapabilities() error {
 	type capHeader struct {
 		version uint32
-		pid     int
+		pid     int32
 	}
 
 	type capData struct {