diff --git a/Tools/ardupilotwaf/chibios.py b/Tools/ardupilotwaf/chibios.py
index aee0d4362f..4d0690c9d8 100644
--- a/Tools/ardupilotwaf/chibios.py
+++ b/Tools/ardupilotwaf/chibios.py
@@ -431,7 +431,7 @@ def build(bld):
     # directly or via another libc call
     wraplist = ['sscanf', 'fprintf', 'snprintf', 'vsnprintf','vasprintf','asprintf','vprintf','scanf',
                 'fiprintf','printf',
-                'fopen', 'fread', 'fflush', 'fwrite', 'fread', 'fputs', 'fgets',
+                'fopen', 'fflush', 'fwrite', 'fread', 'fputs', 'fgets',
                 'clearerr', 'fseek', 'ferror', 'fclose', 'tmpfile', 'getc', 'ungetc', 'feof',
                 'ftell', 'freopen', 'remove', 'vfprintf', 'fscanf' ]
     for w in wraplist: