diff --git a/optional/capi/ext/kernel_spec.c b/optional/capi/ext/kernel_spec.c
index 667a1e8187..eb1eb5a2d3 100644
--- a/optional/capi/ext/kernel_spec.c
+++ b/optional/capi/ext/kernel_spec.c
@@ -28,11 +28,13 @@ VALUE kernel_spec_rb_block_proc(VALUE self) {
 #ifdef HAVE_RB_ENSURE
 VALUE kernel_spec_rb_ensure(VALUE self, VALUE main_proc, VALUE arg,
                             VALUE ensure_proc, VALUE arg2) {
-  VALUE main_array = rb_ary_new();
+  VALUE main_array, ensure_array;
+
+  main_array = rb_ary_new();
   rb_ary_push(main_array, main_proc);
   rb_ary_push(main_array, arg);
 
-  VALUE ensure_array = rb_ary_new();
+  ensure_array = rb_ary_new();
   rb_ary_push(ensure_array, ensure_proc);
   rb_ary_push(ensure_array, arg2);
 
@@ -66,11 +68,13 @@ VALUE kernel_spec_rb_throw(VALUE self, VALUE result) {
 #ifdef HAVE_RB_RESCUE
 VALUE kernel_spec_rb_rescue(VALUE self, VALUE main_proc, VALUE arg,
                             VALUE raise_proc, VALUE arg2) {
-  VALUE main_array = rb_ary_new();
+  VALUE main_array, raise_array;
+
+  main_array = rb_ary_new();
   rb_ary_push(main_array, main_proc);
   rb_ary_push(main_array, arg);
 
-  VALUE raise_array = rb_ary_new();
+  raise_array = rb_ary_new();
   rb_ary_push(raise_array, raise_proc);
   rb_ary_push(raise_array, arg2);
 
@@ -81,11 +85,13 @@ VALUE kernel_spec_rb_rescue(VALUE self, VALUE main_proc, VALUE arg,
 
 #ifdef HAVE_RB_RESCUE2
 VALUE kernel_spec_rb_rescue2(int argc, VALUE *args, VALUE self) {
-  VALUE main_array = rb_ary_new();
+  VALUE main_array, raise_array;
+
+  main_array = rb_ary_new();
   rb_ary_push(main_array, args[0]);
   rb_ary_push(main_array, args[1]);
 
-  VALUE raise_array = rb_ary_new();
+  raise_array = rb_ary_new();
   rb_ary_push(raise_array, args[2]);
   rb_ary_push(raise_array, args[3]);
 
diff --git a/optional/capi/ext/thread_spec.c b/optional/capi/ext/thread_spec.c
index 6a190e2ec3..99e9948df5 100644
--- a/optional/capi/ext/thread_spec.c
+++ b/optional/capi/ext/thread_spec.c
@@ -49,13 +49,14 @@ static VALUE thread_spec_rb_thread_local_aset(VALUE self, VALUE thr, VALUE sym,
 #ifdef HAVE_RB_THREAD_SELECT
 static VALUE thread_spec_rb_thread_select_fd(VALUE self, VALUE fd_num, VALUE msec) {
   int fd = NUM2INT(fd_num);
+  struct timeval tv = {0, NUM2INT(msec)};
+  int n;
 
   fd_set read;
   FD_ZERO(&read);
   FD_SET(fd, &read);
 
-  struct timeval tv = {0, NUM2INT(msec)};
-  int n = rb_thread_select(fd + 1, &read, NULL, NULL, &tv);
+  n = rb_thread_select(fd + 1, &read, NULL, NULL, &tv);
   if(n == 1 && FD_ISSET(fd, &read)) return Qtrue;
   return Qfalse;
 }