--- a/src/gcc/ada/s-oscons-tmplt.c
+++ b/src/gcc/ada/s-oscons-tmplt.c
@@ -1769,9 +1769,12 @@ CNS(MAX_tv_sec, "")
   struct timespec ts;
 /*
    --  Sizes (in bytes) of the components of struct timespec.
-   --  The tv_sec field is the same than in struct timeval.
+   --  The tv_sec component is the same size as in struct timeval.
+   --  In order to avoid the endian issues in the glibc __timespec64
+   --  struct, we use the same size for the tv_nsec component as the
+   --  tv_sec component.
 */
-#define SIZEOF_tv_nsec (sizeof (ts.tv_nsec))
+#define SIZEOF_tv_nsec (sizeof (ts.tv_sec))
 CND(SIZEOF_tv_nsec, "tv_nsec");
 }