diff --git a/YogaKit/Source/YGLayout.m b/YogaKit/Source/YGLayout.m
index 35d00b96..4a9ab872 100644
--- a/YogaKit/Source/YGLayout.m
+++ b/YogaKit/Source/YGLayout.m
@@ -180,7 +180,7 @@ static YGConfigRef globalConfig;
   // the measure function. Since we already know that this is a leaf,
   // this *should* be fine. Forgive me Hack Gods.
   const YGNodeRef node = self.node;
-  if (YGNodeHasMeasureFunc(node)) {
+  if (!YGNodeHasMeasureFunc(node)) {
     YGNodeSetMeasureFunc(node, YGMeasureView);
   }