diff --git a/2005/giljade/Makefile b/2005/giljade/Makefile
index 32197ebcf..c75d0e09b 100644
--- a/2005/giljade/Makefile
+++ b/2005/giljade/Makefile
@@ -92,7 +92,7 @@ CSTD= -std=gnu99
 #
 # By default we assume nothing:
 #
-ARCH=
+ARCH= -m32
 
 # Defines that are needed to compile
 #
@@ -101,7 +101,7 @@ CDEFINE=
 
 # Include files that are needed to compile
 #
-CINCLUDE=
+CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
@@ -119,7 +119,7 @@ CINCLUDE=
 #OPT= -O
 #OPT= -O1
 #OPT= -O2
-OPT= -O3
+OPT=
 
 # Default flags for ANSI C compilation
 #
@@ -188,6 +188,7 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
+	@echo "NOTE: this entry requires 32-bit architecture in order to run properly"
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable
diff --git a/2005/giljade/README.md b/2005/giljade/README.md
index c5dbba305..2712625ca 100644
--- a/2005/giljade/README.md
+++ b/2005/giljade/README.md
@@ -12,6 +12,18 @@
 make
 ```
 
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) discovered that there
+are two things that are needed in order to get this to work in modern systems.
+First it needs 32-bit architecture so the Makefile now has `-m32`. It appears
+it's because of the size of ints being different which affects the bitwise
+operations though this is just a hunch. Second is the optimiser cannot be
+enabled for this to work. Both changes made and it works. This does prove a
+problem for macOS as it no longer easily allows for compiling with 32-bit
+possibly even if you have the Intel chip (it certainly does not work with arm64
+macOS). It might be possible to get the entry to work with 64-bit by changing
+the int size but this is currently unknown.
+
+
 ### To run:
 
 ```sh