diff --git a/linux-user/arm/syscall.h b/linux-user/arm/syscall.h
index 0ced33ee5b..645036174d 100644
--- a/linux-user/arm/syscall.h
+++ b/linux-user/arm/syscall.h
@@ -28,3 +28,9 @@ struct target_pt_regs {
 #define ARM_SYSCALL_BASE	0x900000
 
 #define ARM_NR_cacheflush (ARM_SYSCALL_BASE + 0xf0000 + 2)
+
+#if defined(TARGET_WORDS_BIGENDIAN)
+#define UNAME_MACHINE "armv4b"
+#else
+#define UNAME_MACHINE "armv4l"
+#endif
diff --git a/linux-user/i386/syscall.h b/linux-user/i386/syscall.h
index e1f470d78f..cc0942b811 100644
--- a/linux-user/i386/syscall.h
+++ b/linux-user/i386/syscall.h
@@ -218,3 +218,4 @@ union target_semun {
     unsigned int __pad;	/* really void* */
 };
 
+#define UNAME_MACHINE "i686"
diff --git a/linux-user/ppc/syscall.h b/linux-user/ppc/syscall.h
index e7ded9974b..eea8a7c9ab 100644
--- a/linux-user/ppc/syscall.h
+++ b/linux-user/ppc/syscall.h
@@ -127,3 +127,4 @@ union target_semun {
     unsigned int __pad;	/* really void* */
 };
 
+#define UNAME_MACHINE "ppc"
diff --git a/linux-user/sparc/syscall.h b/linux-user/sparc/syscall.h
index 474c87c305..5be90fa7f9 100644
--- a/linux-user/sparc/syscall.h
+++ b/linux-user/sparc/syscall.h
@@ -5,3 +5,5 @@ struct target_pt_regs {
 	target_ulong y;
 	target_ulong u_regs[16];
 };
+
+#define UNAME_MACHINE "sun4"