diff --git a/misc/cgo/testcshared/main2.c b/misc/cgo/testcshared/main2.c
index 14a8b3f4db..9752006f79 100644
--- a/misc/cgo/testcshared/main2.c
+++ b/misc/cgo/testcshared/main2.c
@@ -9,7 +9,7 @@
 #include <time.h>
 #include <unistd.h>
 
-#define fd (10)
+#define fd (100)
 
 // Tests libgo2.so, which does not export any functions.
 // Read a string from the file descriptor and print it.
diff --git a/misc/cgo/testcshared/src/libgo2/libgo2.go b/misc/cgo/testcshared/src/libgo2/libgo2.go
index 636679b978..1b69d8f09f 100644
--- a/misc/cgo/testcshared/src/libgo2/libgo2.go
+++ b/misc/cgo/testcshared/src/libgo2/libgo2.go
@@ -21,7 +21,7 @@ import (
 // that the C code can also use.
 
 const (
-	fd = 10
+	fd = 100
 )
 
 func init() {