diff --git a/cfg/avr.cfg b/cfg/avr.cfg
index 0d40a5f89..b86070b59 100644
--- a/cfg/avr.cfg
+++ b/cfg/avr.cfg
@@ -4,7 +4,7 @@
   <!-- stdint.h -->
   <define name="__USING_MINT8" value="0"/>
   <define name="__CONCATenate(left, right)" value="left ## right"/>
-  <define name="__CONCAT(left, right)" value="__CONCATenate(left, right)"/> 
+  <define name="__CONCAT(left, right)" value="__CONCATenate(left, right)"/>
   <!-- Integer types capable of holding object pointers -->
   <podtype name="intptr_t" sign="s" size="2"/>
   <podtype name="uintptr_t" sign="u" size="2"/>
@@ -106,7 +106,6 @@
   <define name="M_2_SQRTPI" value="1.12837916709551257390"/>
   <define name="M_SQRT2" value="1.41421356237309504880"/>
   <define name="M_SQRT1_2" value="0.70710678118654752440"/>
-  <define name="NAN" value="__builtin_nan(\”\”)"/>
   <define name="powf" value="pow"/>
   <define name="roundf" value="round"/>
   <define name="signbitf" value="signbit"/>
@@ -118,5 +117,5 @@
   <define name="tanhf" value="tanh"/>
   <define name="truncf" value="trunc"/>
   <!-- The rest of the trigonometric functions are defined in std.cfg -->
-  <!-- setjmp.h -->           
+  <!-- setjmp.h -->          
 </def>