diff --git a/blosc/blosc.c b/blosc/blosc.c
index a04e161..ad800df 100644
--- a/blosc/blosc.c
+++ b/blosc/blosc.c
@@ -240,6 +240,9 @@ static void my_free(void *block)
 
 
 /* Copy 4 bytes from `*pa` to int32_t, changing endianness if necessary. */
+/* This routine is not strict-aliasing safe, particularly if it is
+   inlined into its caller.  So use attributes to prevent that.  */
+__attribute__ ((noinline,noclone,noipa))
 static int32_t sw32_(const uint8_t *pa)
 {
   int32_t idest;
@@ -266,6 +269,9 @@ static int32_t sw32_(const uint8_t *pa)
 
 
 /* Copy 4 bytes from `*pa` to `*dest`, changing endianness if necessary. */
+/* This routine is not strict-aliasing safe, particularly if it is
+   inlined into its caller.  So use attributes to prevent that.  */
+__attribute__ ((noinline,noclone,noipa))
 static void _sw32(uint8_t* dest, int32_t a)
 {
   uint8_t *pa = (uint8_t *)&a;