diff --git a/xmpsdk/src/XMPMeta.cpp b/xmpsdk/src/XMPMeta.cpp
index 30ff4a5a75..6f317a7408 100644
--- a/xmpsdk/src/XMPMeta.cpp
+++ b/xmpsdk/src/XMPMeta.cpp
@@ -87,7 +87,7 @@ static const char * kTenSpaces = "          ";
 #define OutProcHexInt(num)	{ snprintf ( buffer, sizeof(buffer), "%X", (num) ); /* AUDIT: Using sizeof for snprintf length is safe */	\
 							  status = (*outProc) ( refCon, buffer, strlen(buffer) );  if ( status != 0 ) goto EXIT; }
 #else
-#define OutProcHexInt(num)	{ snprintf ( buffer, sizeof(buffer), "%lX", (num) ); /* AUDIT: Using sizeof for snprintf length is safe */	\
+#define OutProcHexInt(num)	{ snprintf ( buffer, sizeof(buffer), "%lX", (long)(num) ); /* AUDIT: Using sizeof for snprintf length is safe */	\
 							  status = (*outProc) ( refCon, buffer, strlen(buffer) );  if ( status != 0 ) goto EXIT; }
 #endif