diff --git a/src/main/java/com/diffplug/gradle/eclipserunner/EquinoxLaunchSource.java b/src/main/java/com/diffplug/gradle/eclipserunner/EquinoxLaunchSource.java
index 00fb544f..0e539ac9 100644
--- a/src/main/java/com/diffplug/gradle/eclipserunner/EquinoxLaunchSource.java
+++ b/src/main/java/com/diffplug/gradle/eclipserunner/EquinoxLaunchSource.java
@@ -93,7 +93,7 @@ protected FileSignature calculateState() throws Exception {
 				throw Unhandled.classException(o);
 			}
 		}
-		return FileSignature.signAsList(files);
+		return FileSignature.from(files);
 	}
 
 	/** Returns the files which were resolved. */