diff --git a/src/operators.c b/src/operators.c
index 8c8472bd8e2b601eed3059ad77851172df27556f..43f67b2a0bf783fa7cd69b92f77b43ac90db6816 100644
--- a/src/operators.c
+++ b/src/operators.c
@@ -5,7 +5,7 @@
 \*/
 #include "global.h"
 #include <math.h>
-RCSID("$Id: operators.c,v 1.48 1999/03/02 03:13:24 hubbe Exp $");
+RCSID("$Id: operators.c,v 1.49 1999/03/02 03:22:13 hubbe Exp $");
 #include "interpret.h"
 #include "svalue.h"
 #include "multiset.h"
@@ -1940,7 +1940,7 @@ void init_operators(void)
   /* function(mixed...:int) */
   ADD_EFUN2("`!=",f_ne,tFuncV(,tMix,tInt),OPT_TRY_OPTIMIZE,0,generate_comparison);
   /* function(mixed:int) */
-  add_efun2("`!",f_not,"!function(int(0..0):mixed)&function(mixed:int(0..0))|function(int(0..0):int(1..1))",OPT_TRY_OPTIMIZE,optimize_not,generate_not);
+  add_efun2("`!",f_not,"function(mixed:int(0..1))",OPT_TRY_OPTIMIZE,optimize_not,generate_not);
 
 #define CMP_TYPE "!function(!object...:mixed)&function(mixed...:int(0..1))|function(int|float...:int(0..1))|function(string...:int(0..1))"
   add_efun2("`<", f_lt,CMP_TYPE,OPT_TRY_OPTIMIZE,0,generate_comparison);