diff --git a/FL/Fl_Copy_Surface.H b/FL/Fl_Copy_Surface.H
index 912aacda6..aa2af3ed9 100644
--- a/FL/Fl_Copy_Surface.H
+++ b/FL/Fl_Copy_Surface.H
@@ -54,7 +54,7 @@ private:
   int height;
   Fl_Paged_Device *helper;
 #ifdef __APPLE__
-  Fl_CFMutableDataRef pdfdata;
+  CFMutableDataRef pdfdata;
   CGContextRef oldgc;
   CGContextRef gc;
   void prepare_copy_pdf_and_tiff(int w, int h);
diff --git a/FL/mac.H b/FL/mac.H
index d7ad7fb00..bed13b4c7 100644
--- a/FL/mac.H
+++ b/FL/mac.H
@@ -41,7 +41,7 @@ typedef struct OpaquePMPrintSettings*   PMPrintSettings;
 typedef struct OpaquePMPageFormat*      PMPageFormat;
 typedef struct OpaquePMPrintSession*    PMPrintSession;
 typedef struct CGImage* CGImageRef;
-typedef void *Fl_CFMutableDataRef; // used in Fl_Copy_Surface.H
+typedef struct __CFData* CFMutableDataRef; // used in Fl_Copy_Surface.H
 typedef CGContextRef Fl_Offscreen;
 
 #else // this part must be compiled when building the FLTK libraries
@@ -96,7 +96,6 @@ class NSOpenGLContext;
 #endif // __OBJC__
 
 typedef CGContextRef Fl_Offscreen;
-typedef CFMutableDataRef Fl_CFMutableDataRef;
 #if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
 typedef CGImageAlphaInfo CGBitmapInfo;
 #endif