diff --git a/node/src/main/kotlin/com/r3corda/node/driver/Driver.kt b/node/src/main/kotlin/com/r3corda/node/driver/Driver.kt
index 32ff224270..74e0152c47 100644
--- a/node/src/main/kotlin/com/r3corda/node/driver/Driver.kt
+++ b/node/src/main/kotlin/com/r3corda/node/driver/Driver.kt
@@ -196,8 +196,8 @@ class DriverDSL(
         val cl = ClassLoader.getSystemClassLoader()
         val urls = (cl as URLClassLoader).urLs
         val quasarPattern = ".*quasar.*\\.jar$".toRegex()
-        val quasarPath = urls.map { it.path }.first { quasarPattern.matches(it) }
-        quasarPath
+        val quasarFileUrl = urls.first { quasarPattern.matches(it.path) }
+        Paths.get(quasarFileUrl.toURI()).toString()
     }
 
     val driverNodeConfiguration = NodeConfigurationFromConfig(