diff --git a/container.go b/container.go
index f59bf38b..e0fa600d 100644
--- a/container.go
+++ b/container.go
@@ -753,7 +753,7 @@ type HostConfig struct {
 	MemoryReservation    int64                  `json:"MemoryReservation,omitempty" yaml:"MemoryReservation,omitempty" toml:"MemoryReservation,omitempty"`
 	KernelMemory         int64                  `json:"KernelMemory,omitempty" yaml:"KernelMemory,omitempty" toml:"KernelMemory,omitempty"`
 	MemorySwap           int64                  `json:"MemorySwap,omitempty" yaml:"MemorySwap,omitempty" toml:"MemorySwap,omitempty"`
-	MemorySwappiness     int64                  `json:"MemorySwappiness" yaml:"MemorySwappiness" toml:"MemorySwappiness"`
+	MemorySwappiness     int64                  `json:"MemorySwappiness,omitempty" yaml:"MemorySwappiness,omitempty" toml:"MemorySwappiness,omitempty"`
 	CPUShares            int64                  `json:"CpuShares,omitempty" yaml:"CpuShares,omitempty" toml:"CpuShares,omitempty"`
 	CPUSet               string                 `json:"Cpuset,omitempty" yaml:"Cpuset,omitempty" toml:"Cpuset,omitempty"`
 	CPUSetCPUs           string                 `json:"CpusetCpus,omitempty" yaml:"CpusetCpus,omitempty" toml:"CpusetCpus,omitempty"`