diff --git a/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.h b/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.h
index ee78b7c7f0..a0713e5790 100755
--- a/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.h
+++ b/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.h
@@ -10,7 +10,7 @@
 
 #import "ASTextKitRenderer.h"
 
-typedef void (^ck_text_component_index_block_t)(NSUInteger characterIndex,
+typedef void (^as_text_component_index_block_t)(NSUInteger characterIndex,
                                                 CGRect glyphBoundingRect,
                                                 BOOL *stop);
 
@@ -79,7 +79,7 @@ typedef NS_ENUM(NSUInteger, ASTextKitRendererMeasureOption) {
  Triggers initialization of textkit components, truncation, and sizing.
  */
 - (void)enumerateTextIndexesAtPosition:(CGPoint)position
-                            usingBlock:(ck_text_component_index_block_t)block;
+                            usingBlock:(as_text_component_index_block_t)block;
 
 /**
  Returns the single text index whose glyph's centroid is closest to the given position.
diff --git a/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.mm b/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.mm
index 5fe66b2288..10cb53e7d5 100755
--- a/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.mm
+++ b/AsyncDisplayKit/TextKit/ASTextKitRenderer+Positioning.mm
@@ -258,7 +258,7 @@ static const CGFloat ASTextKitRendererTextCapHeightPadding = 1.3;
   return properGlyphRect;
 }
 
-- (void)enumerateTextIndexesAtPosition:(CGPoint)externalPosition usingBlock:(ck_text_component_index_block_t)block
+- (void)enumerateTextIndexesAtPosition:(CGPoint)externalPosition usingBlock:(as_text_component_index_block_t)block
 {
   // This method is a little complex because it has to call out to client code from inside an enumeration that needs
   // to achieve a lock on the textkit components.  It cannot call out to client code from within that lock so we just