diff --git a/src/resize.cc b/src/resize.cc
index 892f47c8..c2dcf44d 100755
--- a/src/resize.cc
+++ b/src/resize.cc
@@ -261,7 +261,7 @@ class ResizeWorker : public NanAsyncWorker {
 
     // Get window size of interpolator, used for determining shrink vs affine
     int interpolatorWindowSize = InterpolatorWindowSize(baton->interpolator.c_str());
-    if (InterpolatorWindowSize < 0) {
+    if (interpolatorWindowSize < 0) {
       return Error();
     }