diff --git a/source/poodinis/autowire.d b/source/poodinis/autowire.d
index e97ac43..d16980d 100644
--- a/source/poodinis/autowire.d
+++ b/source/poodinis/autowire.d
@@ -8,7 +8,7 @@ public void autowire(Type)(Container container, Type instance) {
 	import std.stdio;
 	foreach (member ; __traits(derivedMembers, Type)) {
 		foreach (attribute; mixin(`__traits(getAttributes, Type.` ~ member ~ `)`) ) {
-			if (is(attribute : Autowire)){
+			if (is(attribute : Autowire) && __traits(getMember, instance, member) is null){
 				__traits(getMember, instance, member) = container.resolve!(typeof(__traits(getMember, instance, member)));
 			}
 		}
diff --git a/test/poodinis/autowiretest.d b/test/poodinis/autowiretest.d
index db78ad4..f0cea0f 100644
--- a/test/poodinis/autowiretest.d
+++ b/test/poodinis/autowiretest.d
@@ -19,7 +19,7 @@ version(unittest) {
 	}
 	
 	class ComponentD {
-		public @Autowire InterfaceA componentC;
+		public @Autowire InterfaceA componentC = null;
 		
 		public bool componentIsNull() {
 			return componentC is null;
@@ -43,4 +43,16 @@ version(unittest) {
 		container.autowire!(ComponentD)(componentD);
 		assert(!componentD.componentIsNull(), "Autowirable dependency failed to autowire");
 	}
+	
+	// Test autowiring will only happen once
+	unittest {
+		auto container = new Container();
+		container.register!(InterfaceA, ComponentC).newInstance();
+		ComponentD componentD = new ComponentD();
+		container.autowire!(ComponentD)(componentD);
+		auto expectedComponent = componentD.componentC;
+		container.autowire!(ComponentD)(componentD);
+		auto actualComponent = componentD.componentC;
+		assert(expectedComponent is actualComponent, "Autowiring the second time wired a different instance");
+	}
 }
\ No newline at end of file