diff --git a/act/runner/run_context.go b/act/runner/run_context.go
index b2c7e2ad..89a61e6e 100644
--- a/act/runner/run_context.go
+++ b/act/runner/run_context.go
@@ -222,7 +222,7 @@ func (rc *RunContext) platformImage() string {
 
 	c := job.Container()
 	if c != nil {
-		return c.Image
+		return rc.ExprEval.Interpolate(c.Image)
 	}
 
 	for _, runnerLabel := range job.RunsOn() {