diff --git a/2015/endoh3/Makefile b/2015/endoh3/Makefile
index cfdec289a..2f478f2f6 100644
--- a/2015/endoh3/Makefile
+++ b/2015/endoh3/Makefile
@@ -57,7 +57,7 @@ ARCH=
 
 # Defines that are needed to compile
 #
-CDEFINE=
+CDEFINE= -fcommon
 
 # Include files that are needed to compile
 #
diff --git a/thanks-for-fixes.md b/thanks-for-fixes.md
index 825f65f5e..f14ea7cf5 100644
--- a/thanks-for-fixes.md
+++ b/thanks-for-fixes.md
@@ -1323,6 +1323,10 @@ were linking errors.
 
 ## [2015/endoh3](2015/endoh3/prog.c) ([README.md](2015/endoh3/README.md]))
 
+Cody fixed this to compile with linux which was having a problem with duplicate
+symbols of `main()`. The fix is through the option `-fcommon` which will let it
+compile like it does with macOS.
+
 The author, Yusuke, supplied the additional source files, which Cody added to
 the repo for us. Yusuke wrote in his [analysis of the
 entry](https://mame-github-io.translate.goog/ioccc-ja-spoilers/2015/endoh3.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp)