diff --git a/src/include/ngspice.h b/src/include/ngspice.h
index 2448ee44d..2846f3579 100644
--- a/src/include/ngspice.h
+++ b/src/include/ngspice.h
@@ -147,7 +147,6 @@ struct timeb timebegin;
 #define isnan _isnan
 #define finite _finite
 #define scalb _scalb
-//#define logb _logb /* not available in spsmp.c */
 #endif
 
 #ifndef HAVE_RANDOM