diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index b3360451a9..71f8b23a4a 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -1959,7 +1959,7 @@ is_even(VALUE x)
 static VALUE
 rmpd_power_by_big_decimal(Real const* x, Real const* exp, ssize_t const n)
 {
-    VALUE log_x, multiplied, y, vn;
+    VALUE log_x, multiplied, y;
 
     if (VpIsZero(exp)) {
 	return ToValue(VpCreateRbObject(n, "1"));
diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index 87101fea5e..6fa0e906ac 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -557,7 +557,7 @@ console_dev(VALUE klass)
 	VALUE out;
 	rb_io_t *ofptr;
 #endif
-	int fd, mode;
+	int fd;
 
 #ifdef CONSOLE_DEVICE_FOR_WRITING
 	fd = open(CONSOLE_DEVICE_FOR_WRITING, O_WRONLY);