diff --git a/1993/vanb/Makefile b/1993/vanb/Makefile
index db4898212..4dae75f2b 100644
--- a/1993/vanb/Makefile
+++ b/1993/vanb/Makefile
@@ -93,7 +93,7 @@ ARCH=
 # Defines that are needed to compile
 #
 #CDEFINE=
-CDEFINE= -DO5=main
+CDEFINE=
 
 # Include files that are needed to compile
 #
@@ -182,7 +182,6 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "NOTE: This entry might not compile when using modern compilers."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable
diff --git a/1993/vanb/README.md b/1993/vanb/README.md
index cb3ff0087..60360df5c 100644
--- a/1993/vanb/README.md
+++ b/1993/vanb/README.md
@@ -10,21 +10,28 @@
 
         make all
 
-NOTE: we could not compile this entry under modern macOS but it will work
-fine under linux. It likely fails to compile under macOS because its gcc is
-actually just clang which is more strict about the type of the third
-argument of main(). If you have gcc under macOS it might work just as well.
-We did not test other systems.
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this to work with
+clang. The problem was that the third arg to main() was not a `char **`. Instead
+`O5()` (which was `main()`) is now its own function which main() calls with the
+right parameters. Thank you Cody for your assistance!
 
 
-### To run
+## To run:
 
 	./vanb 'exp'
 	
 	where:
 	    'exp'	an octal expression
 
-## Judges' comments
+
+## Try:
+
+	./vanb 1+1
+
+	./vanb 4+4
+
+
+## Judges' comments:
     
 The octal expression may contain:
 
diff --git a/1993/vanb/vanb.c b/1993/vanb/vanb.c
index 78c46342f..4fccf44a3 100644
--- a/1993/vanb/vanb.c
+++ b/1993/vanb/vanb.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
-O5(O2,O7,O3)char**O7;{return!(O2+=~01+01)?00:!(O2-=02>01)?printf("\045\157\012"
+int O3;
+int O5(O2, O7, O3)char **O7;{return!(O2+=~01+01)?00:!(O2-=02>01)?printf("\045\157\012"
 ,O5(012,O7+01,00)):!(O2-=02>>01)?(**O7<=067&&**O7>057?O5(03,O7,*(*O7)++-060+010
    *O3):O3                     ):!(O2      -=-O3-      ~O3)?       (072>**
    O7&&060                     <=**O7      ?O5(04      ,O7,012     *O3-060
@@ -25,3 +26,4 @@ O5(O2,O7,O3)char**O7;{return!(O2+=~01+01)?00:!(O2-=02>01)?printf("\045\157\012"
              ,O7,O5(06,O7,                 00)):!(     O2+=-02/    02)?(!(*
 *O7-053)?O5(011,O7,O3+(++*O7,O5(010,O7,00))):!(055^**O7)?O5(011,O7,O3-(03+*(*O7
 )++,O5(0010,O7,00))):O3):!(O2-=0563&0215)?O5(011,O7,O5(010,O7,00)):(++*O7,O3);}
+main(O2,O7)char**O7;{return O5(O2,O7,O3);}