diff --git a/aws/resource_aws_ssm_patch_baseline.go b/aws/resource_aws_ssm_patch_baseline.go
index db7edab03088..6e93aee5b0f4 100644
--- a/aws/resource_aws_ssm_patch_baseline.go
+++ b/aws/resource_aws_ssm_patch_baseline.go
@@ -24,6 +24,7 @@ var ssmPatchOSs = []string{
 	ssm.OperatingSystemAmazonLinux,
 	ssm.OperatingSystemUbuntu,
 	ssm.OperatingSystemRedhatEnterpriseLinux,
+	ssm.OperatingSystemCentos,
 }
 
 func resourceAwsSsmPatchBaseline() *schema.Resource {