diff --git a/src/Summary.cpp b/src/Summary.cpp
index 2d93f429..7554a41b 100644
--- a/src/Summary.cpp
+++ b/src/Summary.cpp
@@ -93,7 +93,7 @@ static void print_threads()
 {
     char buf[32];
     if (Options::i()->affinity() != -1L) {
-        snprintf(buf, 32, ", affinity=0x%" PRIX64, Options::i()->affinity());
+        snprintf(buf, 32, "\x1B[01;37m, affinity=0x%" PRIX64, Options::i()->affinity());
     }
     else {
         buf[0] = '\0';