diff --git a/src/ruby/ext/grpc/rb_call_credentials.c b/src/ruby/ext/grpc/rb_call_credentials.c
index 38bf1f7710f..615bf9415d5 100644
--- a/src/ruby/ext/grpc/rb_call_credentials.c
+++ b/src/ruby/ext/grpc/rb_call_credentials.c
@@ -35,7 +35,6 @@
 #include "rb_grpc_imports.generated.h"
 #include "rb_call_credentials.h"
 
-#include <ruby/ruby.h>
 #include <ruby/thread.h>
 
 #include <grpc/grpc.h>
@@ -86,11 +85,11 @@ static VALUE grpc_rb_call_credentials_callback_rescue(VALUE args,
       rb_funcall(exception_object, rb_intern("backtrace"), 0),
       rb_intern("join"),
       1, rb_str_new2("\n\tfrom "));
-  VALUE exception_info = rb_funcall(exception_object, rb_intern("to_s"), 0);
+  VALUE rb_exception_info = rb_funcall(exception_object, rb_intern("to_s"), 0);
   const char *exception_classname = rb_obj_classname(exception_object);
   (void)args;
   gpr_log(GPR_INFO, "Call credentials callback failed: %s: %s\n%s",
-          exception_classname, StringValueCStr(exception_info),
+          exception_classname, StringValueCStr(rb_exception_info),
           StringValueCStr(backtrace));
   rb_hash_aset(result, rb_str_new2("metadata"), Qnil);
   /* Currently only gives the exception class name. It should be possible get