diff --git a/C/lz4/lz4frame.c b/C/lz4/lz4frame.c
index a0a625b0..08588318 100644
--- a/C/lz4/lz4frame.c
+++ b/C/lz4/lz4frame.c
@@ -63,6 +63,7 @@ You can contact the author at :
 #include "lz4.h"
 #include "lz4hc.h"
 #define XXH_STATIC_LINKING_ONLY
+#define XXH_NAMESPACE lz
 #include "xxhash.h"
 
 
diff --git a/C/lz4/lz4xxhash.c b/C/lz4/lz4xxhash.c
index e9ff2d42..bc9f61ef 100644
--- a/C/lz4/lz4xxhash.c
+++ b/C/lz4/lz4xxhash.c
@@ -105,6 +105,7 @@ static void  XXH_free  (void* p)  { free(p); }
 static void* XXH_memcpy(void* dest, const void* src, size_t size) { return memcpy(dest,src,size); }
 
 #define XXH_STATIC_LINKING_ONLY
+#define XXH_NAMESPACE lz
 #include "xxhash.h"
 
 
diff --git a/C/lz5/lz5frame.c b/C/lz5/lz5frame.c
index f6e4773b..138ee29a 100644
--- a/C/lz5/lz5frame.c
+++ b/C/lz5/lz5frame.c
@@ -63,6 +63,7 @@ You can contact the author at :
 #include "lz5frame_static.h"
 #include "lz5.h"
 #include "lz5hc.h"
+#define XXH_NAMESPACE lz
 #include "xxhash.h"
 
 
diff --git a/C/lz5/lz5xxhash.c b/C/lz5/lz5xxhash.c
index 511d9941..3ca630ce 100644
--- a/C/lz5/lz5xxhash.c
+++ b/C/lz5/lz5xxhash.c
@@ -106,6 +106,7 @@ You can contact the author at :
 /**************************************
 *  Includes & Memory related functions
 ***************************************/
+#define XXH_NAMESPACE lz
 #include "xxhash.h"
 /* Modify the local functions below should you wish to use some other memory routines */
 /* for malloc(), free() */