diff --git a/yaml/cond.go b/yaml/cond.go
index 713a16d..a26a021 100644
--- a/yaml/cond.go
+++ b/yaml/cond.go
@@ -18,15 +18,16 @@ import filepath "github.com/bmatcuk/doublestar"
 
 // Conditions defines a group of conditions.
 type Conditions struct {
-	Cron     Condition `json:"cron,omitempty"`
-	Ref      Condition `json:"ref,omitempty"`
-	Repo     Condition `json:"repo,omitempty"`
-	Instance Condition `json:"instance,omitempty"`
-	Target   Condition `json:"target,omitempty"`
-	Event    Condition `json:"event,omitempty"`
-	Branch   Condition `json:"branch,omitempty"`
-	Status   Condition `json:"status,omitempty"`
-	Paths    Condition `json:"paths,omitempty"`
+	Cron     Condition         `json:"cron,omitempty"`
+	Ref      Condition         `json:"ref,omitempty"`
+	Repo     Condition         `json:"repo,omitempty"`
+	Instance Condition         `json:"instance,omitempty"`
+	Target   Condition         `json:"target,omitempty"`
+	Event    Condition         `json:"event,omitempty"`
+	Branch   Condition         `json:"branch,omitempty"`
+	Status   Condition         `json:"status,omitempty"`
+	Paths    Condition         `json:"paths,omitempty"`
+	Matrix   map[string]string `json:"matrix,omitempty"`
 }
 
 // Condition defines a runtime condition.
diff --git a/yaml/converter/legacy/internal/config.go b/yaml/converter/legacy/internal/config.go
index 14a9070..5714632 100644
--- a/yaml/converter/legacy/internal/config.go
+++ b/yaml/converter/legacy/internal/config.go
@@ -91,6 +91,40 @@ func Convert(d []byte) ([]byte, error) {
 			current := pipeline
 			current.Name = fmt.Sprintf("matrix-%d", index+1)
 
+			services := make([]*droneyaml.Container, 0)
+			for _, service := range current.Services {
+				if len(service.When.Matrix) == 0 {
+					services = append(services, service)
+					continue
+				}
+
+				for whenKey, whenValue := range service.When.Matrix {
+					for envKey, envValue := range environ {
+						if whenKey == envKey && whenValue == envValue {
+							services = append(services, service)
+						}
+					}
+				}
+			}
+			current.Services = services
+
+			steps := make([]*droneyaml.Container, 0)
+			for _, step := range current.Steps {
+				if len(step.When.Matrix) == 0 {
+					steps = append(steps, step)
+					continue
+				}
+
+				for whenKey, whenValue := range step.When.Matrix {
+					for envKey, envValue := range environ {
+						if whenKey == envKey && whenValue == envValue {
+							steps = append(steps, step)
+						}
+					}
+				}
+			}
+			current.Steps = steps
+
 			marshaled, err := yaml.Marshal(&current)
 
 			if err != nil {
@@ -180,6 +214,7 @@ func toConditions(from Constraints) droneyaml.Conditions {
 			Include: from.Status.Include,
 			Exclude: from.Status.Exclude,
 		},
+		Matrix: from.Matrix,
 	}
 }
 
diff --git a/yaml/converter/legacy/internal/constraint.go b/yaml/converter/legacy/internal/constraint.go
index 8131a17..518db2a 100644
--- a/yaml/converter/legacy/internal/constraint.go
+++ b/yaml/converter/legacy/internal/constraint.go
@@ -14,6 +14,7 @@ type (
 		Event       Constraint
 		Branch      Constraint
 		Status      Constraint
+		Matrix      map[string]string
 	}
 
 	// Constraint defines a runtime constraint.