diff --git a/src/ir.cpp b/src/ir.cpp
index cdf11f1801..350459db23 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -20254,6 +20254,11 @@ static void buf_write_value_bytes(CodeGen *codegen, uint8_t *buf, ConstExprValue
             bigint_write_twos_complement(&val->data.x_bigint, buf, val->type->data.integral.bit_count,
                     codegen->is_big_endian);
             return;
+        case ZigTypeIdEnum:
+            bigint_write_twos_complement(&val->data.x_enum_tag, buf,
+                    val->type->data.enumeration.tag_int_type->data.integral.bit_count,
+                    codegen->is_big_endian);
+            return;
         case ZigTypeIdFloat:
             float_write_ieee597(val, buf, codegen->is_big_endian);
             return;
@@ -20285,8 +20290,6 @@ static void buf_write_value_bytes(CodeGen *codegen, uint8_t *buf, ConstExprValue
             zig_panic("TODO buf_write_value_bytes error union");
         case ZigTypeIdErrorSet:
             zig_panic("TODO buf_write_value_bytes pure error type");
-        case ZigTypeIdEnum:
-            zig_panic("TODO buf_write_value_bytes enum type");
         case ZigTypeIdFn:
             zig_panic("TODO buf_write_value_bytes fn type");
         case ZigTypeIdUnion:
diff --git a/test/cases/bitcast.zig b/test/cases/bitcast.zig
index 878140954a..0857f88e57 100644
--- a/test/cases/bitcast.zig
+++ b/test/cases/bitcast.zig
@@ -16,3 +16,20 @@ fn conv(x: i32) u32 {
 fn conv2(x: u32) i32 {
     return @bitCast(i32, x);
 }
+
+test "@bitCast extern enum to its integer type" {
+    const SOCK = extern enum {
+        A,
+        B,
+
+        fn testBitCastExternEnum() void {
+            var SOCK_DGRAM = @This().B;
+            var sock_dgram = @bitCast(c_int, SOCK_DGRAM);
+            assert(sock_dgram == 1);
+        }
+    };
+
+    SOCK.testBitCastExternEnum();
+    comptime SOCK.testBitCastExternEnum();
+}
+