diff --git a/moo/lib/pack1.h b/moo/lib/pack1.h
index 4bd87a1..80e154f 100644
--- a/moo/lib/pack1.h
+++ b/moo/lib/pack1.h
@@ -24,7 +24,10 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#if defined(__GNUC__)
+
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+#	pragma pack(push,1)
+#elif defined(__GNUC__)
 #	pragma pack(1)
 #elif defined(__HP_aCC) || defined(__HP_cc)
 #	pragma PACK 1
diff --git a/moo/lib/unpack.h b/moo/lib/unpack.h
index 84acb0f..f960a34 100644
--- a/moo/lib/unpack.h
+++ b/moo/lib/unpack.h
@@ -24,7 +24,10 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#if defined(__GNUC__)
+
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+#	pragma pack(pop)
+#elif defined(__GNUC__)
 #	pragma pack()
 #elif defined(__HP_aCC) || defined(__HP_cc)
 #	pragma PACK