diff --git a/src/main/kotlin/com/beust/kobalt/internal/JvmCompiler.kt b/src/main/kotlin/com/beust/kobalt/internal/JvmCompiler.kt
index d6a34760..16ad1f75 100644
--- a/src/main/kotlin/com/beust/kobalt/internal/JvmCompiler.kt
+++ b/src/main/kotlin/com/beust/kobalt/internal/JvmCompiler.kt
@@ -24,8 +24,9 @@ class JvmCompiler @Inject constructor(val dependencyManager: DependencyManager)
             : TaskResult {
 
         // Dependencies
-        val allDependencies = info.dependencies +
-                dependencyManager.calculateDependencies(project, context!!, info.dependencies)
+        val allDependencies = (info.dependencies
+                + dependencyManager.calculateDependencies(project, context!!, info.dependencies))
+            .distinct()
 
         // Plugins that add flags to the compiler
         val addedFlags = ArrayList(info.compilerArgs) +