diff --git a/src/defs.h b/src/defs.h
index b0721087..06886880 100644
--- a/src/defs.h
+++ b/src/defs.h
@@ -147,14 +147,6 @@
 #   endif
 #endif /* __fallthrough */
 
-#ifndef __packed
-#   if defined(__GNUC__) || __has_attribute(packed)
-#       define __packed __attribute__((packed))
-#   else
-#       define __packed
-#   endif
-#endif /* __packed */
-
 #ifndef __aligned
 #   if defined(__GNUC__) || __has_attribute(aligned)
 #       define __aligned(N) __attribute__((aligned(N)))
diff --git a/test/chrono.h b/test/chrono.h
index 4be7e46e..d5e9f658 100644
--- a/test/chrono.h
+++ b/test/chrono.h
@@ -20,9 +20,11 @@
 
 namespace chrono {
 
+#pragma pack(push, 1)
+
 typedef union time {
   uint64_t fixedpoint;
-  struct __packed {
+  struct {
 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
     uint32_t fractional;
     union {
@@ -42,6 +44,8 @@ typedef union time {
   uint32_t seconds() const { return utc; }
 } time;
 
+#pragma pack(pop)
+
 uint32_t ns2fractional(uint32_t);
 uint32_t fractional2ns(uint32_t);
 uint32_t us2fractional(uint32_t);