diff --git a/code/ryzom/client/src/seven_zip/7zArcIn.cpp b/code/ryzom/client/src/seven_zip/7zArcIn.cpp
index 06e35de0d..ca2d5f6eb 100644
--- a/code/ryzom/client/src/seven_zip/7zArcIn.cpp
+++ b/code/ryzom/client/src/seven_zip/7zArcIn.cpp
@@ -1,5 +1,5 @@
 /* 7zArcIn.c -- 7z Input functions
-2015-11-18 : Igor Pavlov : Public domain */
+2016-03-31 : Igor Pavlov : Public domain */
 
 #include "Precomp.h"
 
@@ -788,13 +788,9 @@ static SRes ReadUnpackInfo(CSzAr *p,
       numCodersOutStreams += numCoders;
       if (numCodersOutStreams < numCoders)
         return SZ_ERROR_UNSUPPORTED;
-      
-      packStreamIndex += numPackStreams;
-      if (packStreamIndex < numPackStreams)
-        return SZ_ERROR_UNSUPPORTED;
-      
-      if (packStreamIndex > p->NumPackStreams)
+      if (numPackStreams > p->NumPackStreams - packStreamIndex)
         return SZ_ERROR_ARCHIVE;
+      packStreamIndex += numPackStreams;
     }
   }
 
diff --git a/code/ryzom/client/src/seven_zip/7zVersion.h b/code/ryzom/client/src/seven_zip/7zVersion.h
index c4f5c8e94..d4c603678 100644
--- a/code/ryzom/client/src/seven_zip/7zVersion.h
+++ b/code/ryzom/client/src/seven_zip/7zVersion.h
@@ -1,14 +1,14 @@
-#define MY_VER_MAJOR 15
-#define MY_VER_MINOR 14
+#define MY_VER_MAJOR 16
+#define MY_VER_MINOR 00
 #define MY_VER_BUILD 0
-#define MY_VERSION_NUMBERS "15.14"
-#define MY_VERSION "15.14"
-#define MY_DATE "2015-12-31"
+#define MY_VERSION_NUMBERS "16.00"
+#define MY_VERSION "16.00"
+#define MY_DATE "2016-05-10"
 #undef MY_COPYRIGHT
 #undef MY_VERSION_COPYRIGHT_DATE
 #define MY_AUTHOR_NAME "Igor Pavlov"
 #define MY_COPYRIGHT_PD "Igor Pavlov : Public domain"
-#define MY_COPYRIGHT_CR "Copyright (c) 1999-2015 Igor Pavlov"
+#define MY_COPYRIGHT_CR "Copyright (c) 1999-2016 Igor Pavlov"
 
 #ifdef USE_COPYRIGHT_CR
   #define MY_COPYRIGHT MY_COPYRIGHT_CR
diff --git a/code/ryzom/client/src/seven_zip/CpuArch.cpp b/code/ryzom/client/src/seven_zip/CpuArch.cpp
index 36fc5bb49..554ffa4fc 100644
--- a/code/ryzom/client/src/seven_zip/CpuArch.cpp
+++ b/code/ryzom/client/src/seven_zip/CpuArch.cpp
@@ -1,5 +1,5 @@
 /* CpuArch.c -- CPU specific code
-2015-03-25: Igor Pavlov : Public domain */
+2016-02-25: Igor Pavlov : Public domain */
 
 #include "Precomp.h"
 
@@ -45,7 +45,8 @@ static UInt32 CheckFlag(UInt32 flag)
     "push %%EDX\n\t"
     "popf\n\t"
     "andl %%EAX, %0\n\t":
-    "=c" (flag) : "c" (flag));
+    "=c" (flag) : "c" (flag) :
+    "%eax", "%edx");
   #endif
   return flag;
 }
@@ -79,7 +80,13 @@ void MyCPUID(UInt32 function, UInt32 *a, UInt32 *b, UInt32 *c, UInt32 *d)
   #else
 
   __asm__ __volatile__ (
-  #if defined(MY_CPU_X86) && defined(__PIC__)
+  #if defined(MY_CPU_AMD64) && defined(__PIC__)
+    "mov %%rbx, %%rdi;"
+    "cpuid;"
+    "xchg %%rbx, %%rdi;"
+    : "=a" (*a) ,
+      "=D" (*b) ,
+  #elif defined(MY_CPU_X86) && defined(__PIC__)
     "mov %%ebx, %%edi;"
     "cpuid;"
     "xchgl %%ebx, %%edi;"