diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index e2ba0bb..b79d2df 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -48,6 +48,12 @@
 #define TARGET_IOC_NRBITS	8
 #define TARGET_IOC_TYPEBITS	8
 
+#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) \
+    || defined(TARGET_M68K) || defined(TARGET_SH4) || defined(TARGET_CRIS)
+    /* 16 bit uid wrappers emulation */
+#define USE_UID16
+#endif
+
 #if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SH4) \
     || defined(TARGET_M68K) || defined(TARGET_CRIS)