diff --git a/docker/validators.go b/docker/validators.go
index 859077f9..a0493098 100644
--- a/docker/validators.go
+++ b/docker/validators.go
@@ -30,7 +30,7 @@ func validateIntegerGeqThan(threshold int) schema.SchemaValidateFunc {
 		value := v.(int)
 		if value < threshold {
 			errors = append(errors, fmt.Errorf(
-				"%q cannot be lower than %q", k, threshold))
+				"%q cannot be lower than %d", k, threshold))
 		}
 		return
 	}