diff --git a/linux-user/strace.c b/linux-user/strace.c
index 1398134..5e38048 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -541,6 +541,7 @@
 print_fdset(int n, abi_ulong target_fds_addr)
 {
     int i;
+    int first = 1;
 
     qemu_log("[");
     if( target_fds_addr ) {
@@ -555,9 +556,12 @@
             return;
 
         for (i=n; i>=0; i--) {
-            if ((tswapal(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
-                qemu_log("%d,", i);
+            if ((tswapal(target_fds[i / TARGET_ABI_BITS]) >>
+                (i & (TARGET_ABI_BITS - 1))) & 1) {
+                qemu_log("%s%d", get_comma(first), i);
+                first = 0;
             }
+        }
         unlock_user(target_fds, target_fds_addr, 0);
     }
     qemu_log("]");