diff --git a/code/ryzom/client/src/seven_zip/LzmaDecode.cpp b/code/ryzom/client/src/seven_zip/LzmaDecode.cpp
index 630ddba00..d66ec3589 100644
--- a/code/ryzom/client/src/seven_zip/LzmaDecode.cpp
+++ b/code/ryzom/client/src/seven_zip/LzmaDecode.cpp
@@ -117,7 +117,7 @@
 StopCompilingDueBUG
 #endif
 
-int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, size_t size)
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, SizeT size)
 {
   unsigned char prop0;
   if (size < LZMA_PROPERTIES_SIZE)
diff --git a/code/ryzom/client/src/seven_zip/LzmaDecode.h b/code/ryzom/client/src/seven_zip/LzmaDecode.h
index 5c7bc3ce1..b80996712 100644
--- a/code/ryzom/client/src/seven_zip/LzmaDecode.h
+++ b/code/ryzom/client/src/seven_zip/LzmaDecode.h
@@ -68,7 +68,7 @@ typedef struct _CLzmaProperties
   #endif
 }CLzmaProperties;
 
-int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, size_t size);
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, SizeT size);
 
 #define LzmaGetNumProbs(Properties) (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((Properties)->lc + (Properties)->lp)))