diff --git a/coreblas/compute/global.c b/coreblas/compute/global.c
index 7ce1142c0743561f725484f3cd5a91770e6243d3..e992acfd3c465589084dac5e47b36d437a90fc0c 100644
--- a/coreblas/compute/global.c
+++ b/coreblas/compute/global.c
@@ -57,6 +57,7 @@ void __coreblas_kernel_trace( const char *func, ... )
         size += snprintf( output+size, len-size, "%s%s",
                           first ? "" : ", ",
                           tile->name );
+        first = 0;
     }
     va_end( va_list );