diff --git a/cmd/hapz2m/main.go b/cmd/hapz2m/main.go
index 2635759..4b887fc 100644
--- a/cmd/hapz2m/main.go
+++ b/cmd/hapz2m/main.go
@@ -81,7 +81,7 @@ func readVcsRevision() string {
 				}
 
 			case "vcs.modified":
-				dirty = true
+				dirty = s.Value == "true"
 			}
 		}
 		if dirty {