diff --git a/inc/math.h b/inc/math.h
index 3102f4d..2eba9f1 100644
--- a/inc/math.h
+++ b/inc/math.h
@@ -34,7 +34,7 @@
 
 
 #define INFINITY	(__builtin_inff())
-#define NAN			nan("0")
+#define NAN			(__builtin_nanf("0"))
 
 
 
@@ -61,12 +61,6 @@
 }
 
 
-static inline float nan(const char* arg)
-{
-	return __builtin_nan(arg);
-}
-
-
 static inline float round(float x)
 {
 #ifdef ARM_MATH_CM7