diff --git a/exec.c b/exec.c
index 92ee4e2b706ad30ce003867db9a462d718f667d4..688f603c7ceea8023c7481fb702a50bcb15000b4 100644
--- a/exec.c
+++ b/exec.c
@@ -94,6 +94,10 @@ spinlock_t tb_lock = SPIN_LOCK_UNLOCKED;
 #define code_gen_section                                \
     __attribute__((__section__(".gen_code")))           \
     __attribute__((aligned (32)))
+#elif defined(_WIN32)
+/* Maximum alignment for Win32 is 16. */
+#define code_gen_section                                \
+    __attribute__((aligned (16)))
 #else
 #define code_gen_section                                \
     __attribute__((aligned (32)))