diff --git a/2001/coupard/coupard.c b/2001/coupard/coupard.c
index b5cf042b3..558e41be4 100644
--- a/2001/coupard/coupard.c
+++ b/2001/coupard/coupard.c
@@ -28,7 +28,7 @@ $",p[6789];
 
 int o[]={145,1145,1745,2545,3045,4045,4345,5145,5745,6369},i=0,j=0,l=0;
 
-void e(n,h){
+void e(int n,int h){
  for(j=0;n>0;n-=!(p[j++]^9));
  for(;!n&&j[p]^9;j++)write(1,p+p[j][o],o[p[j]+1]-p[j][o]);
  for(i=0;i<h[o];i++)write(1,d+7,1);}
diff --git a/thanks-for-fixes.md b/thanks-for-fixes.md
index 7b7e32c6e..57f3df3ae 100644
--- a/thanks-for-fixes.md
+++ b/thanks-for-fixes.md
@@ -914,6 +914,23 @@ valid, btw.
 
 ## [2001/coupard](2001/coupard/coupard.c) ([README.md](2001/coupard/README.md]))
 
+Cody fixed this to compile with clang in linux. The problem was C99 does not
+support implicit int:
+
+```c
+coupard.c:31:10: error: parameter 'h' was not declared, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
+void e(n,h){
+         ^
+coupard.c:31:8: error: parameter 'n' was not declared, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
+void e(n,h){
+       ^
+
+```
+
+One fix would be to disable that warning. Another one might be to change the C
+standard. The one that was done, to make it more portable, was to just add 'int'
+to the function parameters.
+
 Thanks go to Yusuke for providing a proper command line for macOS (to do with
 sound; see his [/2013/endoh3/README.md](2013/endoh3/README.md) entry where he
 also refers to sound devices in macOS).