diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/KFiles.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/KFiles.kt
index ec239452..a396827a 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/KFiles.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/misc/KFiles.kt
@@ -37,9 +37,10 @@ class KFiles {
                     // kobalt-wrapper.properties: kobalt.version=0.827
                     // When Kobalt can't find the newest jar file, it will instead use the classes produced by IDEA
                     // in the directories specified here:
-                    val previousVersion = "0." + (Kobalt.version.split(".")[1].toInt() - 1).toString()
+                    val leftSuffix = Kobalt.version.substring(0, Kobalt.version.lastIndexOf(".") + 1)
+                    val previousVersion = leftSuffix + (Kobalt.version.split(".")[1].toInt() - 1).toString()
                     val previousJar = joinDir(distributionsDir, "kobalt-" + previousVersion,
-                            "kobalt/wrapper/kobalt-" + previousVersion + ".jar")
+                            "kobalt/wrapper/kobalt-$previousVersion.jar")
                     val result = listOf("", "modules/kobalt-plugin-api", "modules/wrapper").map {
                         File(homeDir(KFiles.joinDir("kotlin", "kobalt", it, "kobaltBuild", "classes")))
                             .absolutePath