diff -up fltk-1.3.3/src/Fl_cocoa.mm.clip fltk-1.3.3/src/Fl_cocoa.mm
--- fltk-1.3.3/src/Fl_cocoa.mm.clip	2014-11-02 22:06:07.000000000 +0100
+++ fltk-1.3.3/src/Fl_cocoa.mm	2015-04-20 13:45:03.526688921 +0200
@@ -3061,6 +3061,14 @@ static void clipboard_check(void)
   fl_trigger_clipboard_notify(1);
 }
 
+static void resize_selection_buffer(int len, int clipboard) {
+  if (len <= fl_selection_buffer_length[clipboard])
+    return;
+  delete[] fl_selection_buffer[clipboard];
+  fl_selection_buffer[clipboard] = new char[len+100];
+  fl_selection_buffer_length[clipboard] = len+100;
+}
+
 /*
  * create a selection
  * stuff: pointer to selected data
@@ -3069,11 +3077,7 @@ static void clipboard_check(void)
  */
 void Fl::copy(const char *stuff, int len, int clipboard, const char *type) {
   if (!stuff || len<0) return;
-  if (len+1 > fl_selection_buffer_length[clipboard]) {
-    delete[] fl_selection_buffer[clipboard];
-    fl_selection_buffer[clipboard] = new char[len+100];
-    fl_selection_buffer_length[clipboard] = len+100;
-  }
+  resize_selection_buffer(len+1, clipboard);
   memcpy(fl_selection_buffer[clipboard], stuff, len);
   fl_selection_buffer[clipboard][len] = 0; // needed for direct paste
   fl_selection_length[clipboard] = len;
@@ -3087,7 +3091,7 @@ void Fl::copy(const char *stuff, int len
   }
 }
 
-static int get_plain_text_from_clipboard(char **buffer, int previous_length)
+static int get_plain_text_from_clipboard(int clipboard)
 {
   NSInteger length = 0;
   NSPasteboard *clip = [NSPasteboard generalPasteboard];
@@ -3109,21 +3113,17 @@ static int get_plain_text_from_clipboard
 	len = strlen(aux_c) + 1;
       }
       else len = [data length] + 1;
-      if ( len >= previous_length ) {
-	length = len;
-	delete[] *buffer;
-	*buffer = new char[len];
-      }
+      resize_selection_buffer(len, clipboard);
       if (![found isEqualToString:utf8_format]) {
-	strcpy(*buffer, aux_c);
-	free(aux_c);
+        strcpy(fl_selection_buffer[clipboard], aux_c);
+        free(aux_c);
       }
       else {
-	[data getBytes:*buffer];
+        [data getBytes:fl_selection_buffer[clipboard]];
       }
-      (*buffer)[len - 1] = 0;
+      fl_selection_buffer[clipboard][len - 1] = 0;
       length = len - 1;
-      convert_crlf(*buffer, len - 1); // turn all \r characters into \n:
+      convert_crlf(fl_selection_buffer[clipboard], len - 1); // turn all \r characters into \n:
       Fl::e_clipboard_type = Fl::clipboard_plain_text;
     }
   }    
@@ -3218,7 +3218,7 @@ void Fl::paste(Fl_Widget &receiver, int
   if (clipboard) {
     Fl::e_clipboard_type = "";
    if (strcmp(type, Fl::clipboard_plain_text) == 0) {
-      fl_selection_length[1] = get_plain_text_from_clipboard( &fl_selection_buffer[1],  fl_selection_length[1]);   
+      fl_selection_length[1] = get_plain_text_from_clipboard(1);
       }
     else if (strcmp(type, Fl::clipboard_image) == 0) {
       Fl::e_clipboard_data = get_image_from_clipboard( );
