diff --git a/src/rrd_nan_inf.h b/src/rrd_nan_inf.h
--- a/src/rrd_nan_inf.h
+++ /dev/null
@@ -1,5 +0,0 @@
-#define DNAN set_to_DNAN()
-#define DINF set_to_DINF()
-
-double set_to_DNAN(void);
-double set_to_DINF(void);