diff -r 9a98ff4a2290 Modules/_tracemalloc.c
--- a/Modules/_tracemalloc.c	Wed Jan 22 05:49:11 2014 -0800
+++ b/Modules/_tracemalloc.c	Thu Jan 23 00:17:44 2014 +0100
@@ -61,7 +61,9 @@ static PyThread_type_lock tables_lock;
    architectures: 12 bytes instead of 16. This optimization might produce
    SIGBUS on architectures not supporting unaligned memory accesses (64-bit
    IPS CPU?): on such architecture, the structure must not be packed. */
-#pragma pack(4)
+#ifdef _MSC_VER
+#  pragma pack(4)
+#endif
 typedef struct
 #ifdef __GNUC__
 __attribute__((packed))