diff --git a/lib/linux/x86_64-mes-gcc/crt1.c b/lib/linux/x86_64-mes-gcc/crt1.c
index fa066950..0000d7bf 100644
--- a/lib/linux/x86_64-mes-gcc/crt1.c
+++ b/lib/linux/x86_64-mes-gcc/crt1.c
@@ -29,22 +29,22 @@ void
 _start ()
 {
   asm (
-       "mov    $0,%%rax\n\t"
-       "mov    %%rax,%0\n"
+       "mov    $0,%%eax\n\t"
+       "mov    %%eax,%0\n"
        : "=r" (__stdin)
        : //no inputs ""
        );
 
   asm (
-       "mov    $1,%%rax\n\t"
-       "mov    %%rax,%0\n"
+       "mov    $1,%%eax\n\t"
+       "mov    %%eax,%0\n"
        : "=r" (__stdout)
        : //no inputs ""
        );
 
   asm (
-       "mov    $2,%%rax\n\t"
-       "mov    %%rax,%0\n"
+       "mov    $2,%%eax\n\t"
+       "mov    %%eax,%0\n"
        : "=r" (__stderr)
        : //no inputs ""
        );
diff --git a/lib/linux/x86_64-mes/crt1.c b/lib/linux/x86_64-mes/crt1.c
index 0161c93b..35d33c27 100644
--- a/lib/linux/x86_64-mes/crt1.c
+++ b/lib/linux/x86_64-mes/crt1.c
@@ -25,13 +25,13 @@ int
 _start ()
 {
   asm ("mov____$i8,%rax !0");
-  asm ("mov____%rax,0x32 &__stdin");
+  asm ("movl___%eax,0x32 &__stdin");
 
   asm ("mov____$i8,%rax !1");
-  asm ("mov____%rax,0x32 &__stdout");
+  asm ("movl___%eax,0x32 &__stdout");
 
   asm ("mov____$i8,%rax !2");
-  asm ("mov____%rax,0x32 &__stderr");
+  asm ("movl___%eax,0x32 &__stderr");
 
 #if 0                           //MES_CCAMD64
   asm ("add____$i32,%rbp %0x80");       // FIXME: corresponds to x86_64/as.scm function-preamble-fu