diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h
index bfd5938fede6..467dcfcba58b 100755
--- a/tools/include/uapi/linux/mman.h
+++ b/tools/include/uapi/linux/mman.h
@@ -5,8 +5,9 @@
 #include <asm/mman.h>
 #include <asm-generic/hugetlb_encode.h>
 
-#define MREMAP_MAYMOVE	1
-#define MREMAP_FIXED	2
+#define MREMAP_MAYMOVE		1
+#define MREMAP_FIXED		2
+#define MREMAP_DONTUNMAP	4
 
 #define OVERCOMMIT_GUESS		0
 #define OVERCOMMIT_ALWAYS		1
diff --git a/tools/perf/trace/beauty/mmap.c b/tools/perf/trace/beauty/mmap.c
index 51f1cea406f5..91b88fd9617c 100755
--- a/tools/perf/trace/beauty/mmap.c
+++ b/tools/perf/trace/beauty/mmap.c
@@ -85,6 +85,7 @@ static size_t syscall_arg__scnprintf_mremap_flags(char *bf, size_t size,
 
 	P_MREMAP_FLAG(MAYMOVE);
 	P_MREMAP_FLAG(FIXED);
+	P_MREMAP_FLAG(DONTUNMAP);
 #undef P_MREMAP_FLAG
 
 	if (flags)