diff --git a/tests/sys/kqueue/libkqueue/main.c b/tests/sys/kqueue/libkqueue/main.c
index 9b8945e3f2b..33a2ed0d3ee 100644
--- a/tests/sys/kqueue/libkqueue/main.c
+++ b/tests/sys/kqueue/libkqueue/main.c
@@ -235,10 +235,14 @@ kevent_add(int kqfd, struct kevent *kev,
         intptr_t  data,
         void      *udata)
 {
+    char *kev_str;
+    
     EV_SET(kev, ident, filter, flags, fflags, data, NULL);    
     if (kevent(kqfd, kev, 1, NULL, 0, NULL) < 0) {
-        printf("Unable to add the following kevent:\n%s\n",
-                kevent_to_str(kev));
+        kev_str = kevent_to_str(kev);
+	printf("Unable to add the following kevent:\n%s\n",
+                kev_str);
+	free(kev_str);
         err(1, "kevent(): %s", strerror(errno));
     }
 }
@@ -246,6 +250,9 @@ kevent_add(int kqfd, struct kevent *kev,
 void
 kevent_cmp(struct kevent *k1, struct kevent *k2)
 {
+    char *kev1_str;
+    char *kev2_str;
+    
 /* XXX-
    Workaround for inconsistent implementation of kevent(2) 
  */
@@ -258,8 +265,12 @@ kevent_cmp(struct kevent *k1, struct kevent *k2)
       k1->data != k2->data || k1->udata != k2->udata ||
       k1->ext[0] != k2->ext[0] || k1->ext[1] != k2->ext[1] ||
       k1->ext[0] != k2->ext[2] || k1->ext[0] != k2->ext[3]) {
+        kev1_str = kevent_to_str(k1);
+	kev2_str = kevent_to_str(k2);
         printf("kevent_cmp: mismatch:\n  %s !=\n  %s\n", 
-              kevent_to_str(k1), kevent_to_str(k2));
+	       kev1_str, kev2_str);
+	free(kev1_str);
+	free(kev2_str);
         abort();
     }
 }