diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt
index 6f42a48d..08f4c7a0 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/DynamicGraph.kt
@@ -153,7 +153,7 @@ interface IThreadWorkerFactory<T> {
 }
 
 class DynamicGraphExecutor<T>(val graph : DynamicGraph<T>, val factory: IThreadWorkerFactory<T>) {
-    val executor = Executors.newFixedThreadPool(5, NamedThreadFactory("DynamicGraphExecutor"))
+    val executor = Executors.newFixedThreadPool(1, NamedThreadFactory("DynamicGraphExecutor"))
     val completion = ExecutorCompletionService<TaskResult2<T>>(executor)
 
     fun run() : TaskResult {