diff --git a/linux-user/strace.c b/linux-user/strace.c
index d77053b303..bf9a0d9391 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -385,6 +385,9 @@ UNUSED static struct flags mmap_prot_flags[] = {
     FLAG_GENERIC(PROT_EXEC),
     FLAG_GENERIC(PROT_READ),
     FLAG_GENERIC(PROT_WRITE),
+    FLAG_TARGET(PROT_SEM),
+    FLAG_GENERIC(PROT_GROWSDOWN),
+    FLAG_GENERIC(PROT_GROWSUP),
     FLAG_END,
 };
 
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 681021ca0e..46cb05ea9f 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -946,6 +946,12 @@ struct target_winsize {
 
 #include "termbits.h"
 
+#if defined(TARGET_MIPS)
+#define TARGET_PROT_SEM         0x10
+#else
+#define TARGET_PROT_SEM         0x08
+#endif
+
 /* Common */
 #define TARGET_MAP_SHARED	0x01		/* Share changes */
 #define TARGET_MAP_PRIVATE	0x02		/* Changes are private */